I think I may have a computer Virus. please help!?

Lately I've receiving pop-ups and adverts for computer virus cleanups, but upon further inspection, those pop-ups are from Microsoft Internet Explorer, which I do not use. I use Mozilla Firefox. I know about the Conficker, so I did not blindly instal those malicious programmes, and I swept my computer for... show more Lately I've receiving pop-ups and adverts for computer virus cleanups, but upon further inspection, those pop-ups are from Microsoft Internet Explorer, which I do not use. I use Mozilla Firefox.

I know about the Conficker, so I did not blindly instal those malicious programmes, and I swept my computer for spyware.

Still, I continue to receive these pop-ups and today I experienced something very peculiar in which several Internet explorer windows popped up all at once and suddenly disappeared.

What should I do?
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