[KuraFire]

Then you should get rid of the virus first and foremost, before attempting anything else.

Also try using AdAware to get rid of any spyware and adware that may reside on your computer.

And don't forget the 3 basic rules of internet safety:

1) if you use Outlook Express, you are not safe against viruses etc;
2) if you use Internet Explorer and visit new (unknown) websites often, you are not safe;
3) if you accept files, attachments or anything alike from people you don't know, or that have an extension that is either unfamiliar or not a plaintext or image type, you are not safe.

There's tons more but those three form up the majority of why viruses can spread so easily, at the moment.