Security Essentials Code Error (Trojan Virus)

Asked By 0 points N/A Posted on -

When I try to attempt to remove the virus namely TrojanDownloader:win32/Nistio. A microsoft security essentials encountered an error. And the error was, Security Essentials could not apply the action(s) you selected. One or more actions could not be completed successfully.
Security essentials encountered the following error: Error code 0x800700df.
Please see my uploaded image,

Please help me from this problem,
Best Answer by Puckett Buckner
Answered By 0 points N/A #126635

Security Essentials Code Error (Trojan Virus)




You could try to run Windows in Safe mode (F8 menu during system start), execute the scan from here and to not quarantine, but delete infected files.

On the other side I would not trust such a compromised system any more. They tend to hide some components, which will often trigger virus downloads again.

Instead backup your data (scan it as well), delete the OS volume and reinstall the operating system and the applications.

Best greetings 

Daniel Stutter

Best Answer
Best Answer
Answered By 0 points N/A #126636

Security Essentials Code Error (Trojan Virus)



Hello Olfgun,

The reasons for this error code are the amount of the executable files currently running. In most cases, the best way to resolve issues like these is to ask for help in removing malware by clicking on and choose “I think my computer is infected” and select the support you need.

Here are some steps as well to help you rectify this issue: Download Rkill from this link: Run this and use Malwarebytes full scan: and do not restart/reboot. Scan with TdssKiller from this link: then reboot. Update Windows and IE plug ins such as Adobe Reader 10, Flash Java and Showckwave. Disable System Restore and apply to clear for virus.

I hope this helps.




Answered By 30 points N/A #126638

Security Essentials Code Error (Trojan Virus)


Hi Olfgun Modinsson

Having a computer virus like that is such a pain in your head. I think you should get a good Antivirus such as Avast, McAfee, etc. then scan your computer in full system scan. Also you can check out another Techyv thread which is addressed your problem. Go this page and get more and more remedy to fix this issue.

Error code 0x80501001 Microsoft Security Essentials

Login/Register to Answer

Related Questions