You should check that out.
I suggest following:
Go to Panda antivirus online scan and scan your computer (you must use Internet Explorer for this).
http://www.pandasecurity.com/homeuse...ns/activescan/
If this check finds something strange than you should get yourself a decent antivirus software and clean your machine. However in those case you can never be really shure if all traces of antivirus are really cleaned. Safer solution is to do a clean install of windows and right away put a decent commercial antivirus software.
I personally recommend
Eset nod32 or
Kaspersky Antivirus. However even the Microsoft free antivirus is good enough (
http://www.microsoft.com/Security_Essentials/).