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If you can recall, have you been visiting any suspicious website where you would get a virus? If you suspect it's virus, have you used hijackthis, other virus scanners like AVG? Do you have firewall on your router? If so, it's not easy for a virus to infect your computer unless you visited a website and clicked on a link or downloaded a .exe file and opened it.
Do you suspect it's a virus just because revscene load slow? What other website have you tried? If facebook, craiglist is fine, and revscene is the only one that is slow, than I don't think you should suspect it's a virus.
Have you tried different browser other than firefox? Do you have adblock plus for firefox? Is your cpu/ram usage normal at all times? Check your browser's security level.
After reading your second post. You said programs are shutting down one by one. You mean, they close automatically? If so, than someone definitely hacked into your computer and is using your resources. I recommend a reformat immediately. Definitely turn off all network sharing to and from your PC. Some virus/trojan can attack your netwwork, sit in their and camp out whenever another system is vulnerable to invade.
EDIT - also after a reformat, schedule your virus scan to scan daily when you're at work or whenever you're not using your PC.
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