The PUABundler:Win32/Startfenster alert, is a sign that your PC has a problem. Allowing it to keep running may end up with some really bad consequences. Unwanted apps are not as dangerous as regular viruses, but still can mischief and lead to system instability.
Startfenster unwanted application can not be named full-fledged malware. Nonetheless, it has plenty of signs to say that you will not love the changes this thing brings to your PC. PUAs like that may be just a pesky thing, as well as lead to a severe influence on your system’s functionality. Additionally, there are a number of situations when users report that this application collects user information or other sensitive stuff.
PUABundler:Win32/Startfenster Detection Overview
The PUABundler:Win32/Startfenster detection you can see in the lower right corner is shown to you by Microsoft Defender. That anti-malware program is good at scanning, but prone to be generally unreliable. It is prone to malware invasions, it has a glitchy interface and problematic malware clearing features. For this reason, the pop-up which states concerning the Startfenster is rather just a notification that Defender has identified it. To remove it, you will likely need to make use of a separate anti-malware program.
PUABundler:Win32/Startfenster unwanted program is a case in point of PUA, which are pretty common nowadays. Being free to use, it may offer you “the extended capabilities” for the additional payment. Some examples of this program type can have no useful performance at all – just the shell with the colorful interface. You can see it promoted as a system optimization tool, driver updater or torrent downloadings tracker. This or another way it does not grant you any kind of true functionality, exposing you to risk instead.
Unwanted Program Summary:
Name | Startfenster PUA |
Detection | PUABundler:Win32/Startfenster |
Damage | Startfenster is at least useless, or can perform various malicious actions on your PC. |
Fix Tool | See If Your System Has Been Affected by Startfenster exploit |
Is PUABundler:Win32/Startfenster dangerous?
I have actually detailed that PUABundler:Win32/Startfenster PUA is not as safe as it claims to be. The “legit and helpful” tool can suddenly unveil itself as a downloader trojan, spyware, backdoor, or coin miner virus. And you can never figure out what to look for even from separate variants of Startfenster unwanted program. That still does not imply that you need to panic – possibly, this nasty thing has not succeeded to do bad things to your computer.
The exact damage to your system can be created not only as a result of the malware injection. A considerable share of doubtful programs, like the Startfenster application is, is just poorly designed. Potentially, their actions are fairly effective than useless if done on specific system setups, but not on each one. That’s how a basic system optimization tool may trigger chaos with constant BSODs on your system. Any interruptions to the system registry are not very safe, and they are a lot more unsafe if performed with such programs.
How did I get this virus?
It is not easy to line the origins of malware on your computer. Nowadays, things are mixed, and spreading tactics utilized by adware 5 years ago may be utilized by spyware these days. However, if we abstract from the exact distribution tactic and will think of why it works, the explanation will be really simple – low level of cybersecurity awareness. Individuals click on advertisements on weird sites, click the pop-ups they receive in their browsers, call the “Microsoft tech support” believing that the scary banner that says about malware is true. It is very important to know what is legitimate – to avoid misunderstandings when trying to determine a virus.

The example of Microsoft Tech support scam banner
Nowadays, there are two of the most common tactics of malware spreading – bait e-mails and also injection into a hacked program. While the first one is not so easy to avoid – you should know a lot to understand a fake – the second one is very easy to solve: just don’t utilize hacked programs. Torrent-trackers and various other sources of “free” applications (which are, in fact, paid, but with a disabled license checking) are just a giveaway place of malware. And PUABundler:Win32/Startfenster is just amongst them.
Remove Startfenster with Gridinsoft Anti-Malware
We have also been using this software on our systems ever since, and it has always been successful in detecting viruses. It has blocked the most common PUAs as shown from our tests with the software, and we assure you that it can remove Startfenster as well as other malware hiding on your computer.

To use Gridinsoft for remove malicious threats, follow the steps below:
1. Begin by downloading Gridinsoft Anti-Malware, accessible via the blue button below or directly from the official website gridinsoft.com.
2.Once the Gridinsoft setup file (setup-gridinsoft-fix.exe) is downloaded, execute it by clicking on the file.

3.Follow the installation setup wizard's instructions diligently.

4. Access the "Scan Tab" on the application's start screen and launch a comprehensive "Full Scan" to examine your entire computer. This inclusive scan encompasses the memory, startup items, the registry, services, drivers, and all files, ensuring that it detects malware hidden in all possible locations.

Be patient, as the scan duration depends on the number of files and your computer's hardware capabilities. Use this time to relax or attend to other tasks.
5. Upon completion, Anti-Malware will present a detailed report containing all the detected malicious items and threats on your PC.

6. Select all the identified items from the report and confidently click the "Clean Now" button. This action will safely remove the malicious files from your computer, transferring them to the secure quarantine zone of the anti-malware program to prevent any further harmful actions.

8. If prompted, restart your computer to finalize the full system scan procedure. This step is crucial to ensure thorough removal of any remaining threats. After the restart, Gridinsoft Anti-Malware will open and display a message confirming the completion of the scan.
Remember Gridinsoft offers a 6-day free trial. This means you can take advantage of the trial period at no cost to experience the full benefits of the software and prevent any future malware infections on your system. Embrace this opportunity to fortify your computer's security without any financial commitment.
Trojan Killer for “Startfenster” removal on locked PC
In situations where it becomes impossible to download antivirus applications directly onto the infected computer due to malware blocking access to websites, an alternative solution is to utilize the Trojan Killer application.

There is a really little number of security tools that are able to be set up on the USB drives, and antiviruses that can do so in most cases require to obtain quite an expensive license. For this instance, I can recommend you to use another solution of GridinSoft - Trojan Killer Portable. It has a 14-days cost-free trial mode that offers the entire features of the paid version. This term will definitely be 100% enough to wipe malware out.
Trojan Killer is a valuable tool in your cybersecurity arsenal, helping you to effectively remove malware from infected computers. Now, we will walk you through the process of using Trojan Killer from a USB flash drive to scan and remove malware on an infected PC. Remember, always obtain permission to scan and remove malware from a computer that you do not own.
Step 1: Download & Install Trojan Killer on a Clean Computer:
1. Go to the official GridinSoft website (gridinsoft.com) and download Trojan Killer to a computer that is not infected.

2. Insert a USB flash drive into this computer.
3. Install Trojan Killer to the "removable drive" following the on-screen instructions.

4. Once the installation is complete, launch Trojan Killer.
Step 2: Update Signature Databases:
5. After launching Trojan Killer, ensure that your computer is connected to the Internet.
6. Click "Update" icon to download the latest signature databases, which will ensure the tool can detect the most recent threats.

Step 3: Scan the Infected PC:
7. Safely eject the USB flash drive from the clean computer.
8. Boot the infected computer to the Safe Mode.
9. Insert the USB flash drive.
10. Run tk.exe
11. Once the program is open, click on "Full Scan" to begin the malware scanning process.

Step 4: Remove Found Threats:
12. After the scan is complete, Trojan Killer will display a list of detected threats.

13. Click on "Cure PC!" to remove the identified malware from the infected PC.
14. Follow any additional on-screen prompts to complete the removal process.

Step 5: Restart Your Computer:
15. Once the threats are removed, click on "Restart PC" to reboot your computer.
16. Remove the USB flash drive from the infected computer.
Congratulations on effectively removing Startfenster and the concealed threats from your computer! You can now have peace of mind, knowing that they won't resurface again. Thanks to Gridinsoft's capabilities and commitment to cybersecurity, your system is now protected.
How to Protect Your Computer from PUABundler:Win32/Startfenster
As cyber threats continue to evolve, ensuring the security of our computers has become more critical than ever. Malware, short for malicious software, poses a significant risk to our data, privacy, and overall online experience. Follow these simple guidelines to protect your computer:
- Install a Reliable Anti-Malware Solution: Having a robust anti-malware software is your first line of defense against cyber threats. Gridinsoft Anti-Malware is an industry-leading solution that offers real-time protection, thorough system scans, and automatic malware removal. Its constantly updated database ensures it can detect even the newest and most sophisticated threats.
- Keep Your Operating System and Software Updated: Regularly updating your operating system and software is crucial. Updates often include security patches that address vulnerabilities that cybercriminals may exploit. Enable automatic updates to ensure you stay protected.
- Exercise Caution with Email Attachments and Links: Malicious emails often contain infected attachments or links that lead to malware-infested websites. Avoid opening suspicious emails or clicking on unknown links. Be especially wary of emails that urge you to take immediate action or provide sensitive information.
- Use Strong Passwords and Enable Two-Factor Authentication: Strong, unique passwords are essential for protecting your online accounts. Enable two-factor authentication (2FA) whenever possible to add an extra layer of security.
- Avoid Sketchy Websites and Downloads: Stick to reputable websites for your downloads and avoid visiting suspicious or untrustworthy sites. Be cautious with free software downloads from unknown sources.
- Secure Your Network with a Firewall: A firewall acts as a barrier between your computer and the internet, monitoring and blocking unauthorized access. Ensure your firewall is active and properly configured.
Why Choose Gridinsoft Anti-Malware?
Gridinsoft Anti-Malware is a powerful and user-friendly solution designed to keep your computer safe from malware threats like a PUABundler:Win32/Startfenster. Here are some of the key features that make it an excellent choice:
- Comprehensive Malware Detection: Gridinsoft Anti-Malware uses advanced algorithms to detect and remove various types of malware, including the most evasive ones.
- Real-Time Protection: The software provides real-time protection, proactively blocking threats before they can harm your system.
- Regular Updates: Gridinsoft Anti-Malware's database is regularly updated to keep up with the latest malware trends and ensure maximum protection.
- User-Friendly Interface: The software is easy to use, making it suitable for both novice and experienced users.
- 24/7 Customer Support: Gridinsoft offers dedicated customer support to assist with any issues or questions you may have.
Securing your computer from malware is essential in today's digital landscape. By following best practices, such as installing a reliable anti-malware solution like Gridinsoft Anti-Malware, keeping your system up to date, and exercising caution online, you can significantly reduce the risk of falling victim to cyber threats. With Gridinsoft Anti-Malware's robust protection and user-friendly interface, you can enjoy peace of mind knowing your computer is safe and secure. Stay vigilant, stay protected!
Gridinsoft Anti-Malware is a powerful and reliable anti-malware software that provides comprehensive protection against all types of cyber threats. Don't wait for PUABundler:Win32/Startfenster to strike—take proactive steps to safeguard your computer today!
What is PUABundler:Win32/Startfenster Virus?

Name: PUABundler:Win32/Startfenster
Description: If you have seen a message showing the “PUABundler:Win32/Startfenster found”, it seems that your system is in trouble. The Startfenster virus was detected, but to remove it, you need to use a security tool. Windows Defender, which has shown you this message, has detected the malware. However, Defender is not a reliable thing - it is prone to malfunction when it comes to malware removal. Getting the PUABundler:Win32/Startfenster malware on your PC is an unpleasant thing, and removing it as soon as possible must be your primary task.
Operating System: Windows
Application Category: PUA