Hi Aerofoil,
Please download 'Hijack This!' from
here, unzip, doubleclick HijackThis.exe, and hit "Scan". When the scan is finished, click "Save Log", and copy and paste it in a reply.
This will give me a rundown of what’s going on in your PC. It'll highlight any potential mal/spy/adware and, usually, clues to virii as well.
Don’t fix anything yourself yet, as a lot of the stuff on that list will be harmless or required.
Cheers
Liam