What is VirusLocker?
It is counterfeit anti-spyware software being spread by a trojan. Infection can be noticed by fake alert balloon continuously coming up and directing to VirusLocker page, expecting user to download rogue software. After PC scan, user is prompted to buy registered program version to remove found security breaches. VirusLocker will not remove spyware and virus as promised.
Also known as VirusLocker 3.4.
Fake security alert:

Also known as VirusLocker 3.4.
Fake security alert:

VirusLocker removal tool:
- Spyware Doctor (see here for the installation guide)
Screenshot:

VirusLocker Entries:
The following files are created: VirusLocker.exe, vl_setup.exe (setup file)
Hijackthis Entries:
O4 - HKLM\..\Run: [VirusLocker] C:\Program Files\VirusLocker\VirusLocker.exe /h