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"Error code 0x80501001: Cannot remove identified 'worm' virus" in Microsoft Security Essentials

Symptoms
When you run Microsoft Security Essentials (MSE), you receive the following error message: 
Error code 0x80501001: Cannot remove identified 'worm' virus


You are instructed to remove the error immediately. However, when you run a scan to remove the error, the scan does not run. 
Cause
This error message indicates that the computer has been infected by the Win32/Alureon trojan virus.
Resolution
The Alureon trojan virus is difficult to remove. This infection is identified by MSE as a rootkit in the master boot record. You can try steps to salvage your operating system. However, many IT professionals recommend that the operating system be reinstalled to make sure that the rootkit is removed. 

Because you are using Microsoft Security Essentials, you can obtain assistance from MS Support with malware removal. To obtain assistance, follow these steps:
  1. Visit https://support.microsoftsecurityessentials.com.
  2. In the Scanning, detecting, and removing threats area, click I think my computer is infected.
  3. Select your country, and then click Continue.
  4. Select the type of support that you want for Microsoft Security Essentials.

Note If you back up your files at this time, you may be also backing up Alureon. 
More information
For more information about the Win32/Alureon trojan virus, see Win32/Alureon.
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Article ID: 2688684 - Last Review: 07/12/2013 10:24:00 - Revision: 2.1

Microsoft® Security Essentials

  • kbsurveynew KB2688684
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