VIRGIN MEDIA SECURITY
malwarebytes antimalware NOT THE PAID FOR ONE
So you're using old and crappy software.
Ditch IE8 asap and get a real browser, as rhoobarb suggested get Firefox.
If you can upgrade to Win7 (xp isn't even supported by M$ anymore..) do so.
Virgin Media Security is not a viable antivirus. Switch to a free one ASAP that'll do a better job while using less resources. MSE or Avira/Avast, any of those 3 works.
Can't go wrong with malwarebytes, don't pay for it ever. It's unnecessary. Are you running the scan from safe mode?