How do I get rid of W32/Gaobot.worm.gen.u - Win32/RBot.3eu!Worm ?

When I turned on my computer I got the following message: Windows has detected W32/Gaobot.worm.gen.u - Win32/RBot.3eu!Worm, a known computer virus, on your computer. How do I get rid of this? It plays ads (sound only) when I use my computer - and I'm sure it does other nasty things as well. I'm not... show more When I turned on my computer I got the following message:

Windows has detected W32/Gaobot.worm.gen.u - Win32/RBot.3eu!Worm, a known computer virus, on your computer.

How do I get rid of this? It plays ads (sound only) when I use my computer - and I'm sure it does other nasty things as well. I'm not familiar with computers at all so I'm not too sure what I'm supposed to do.

I don't have a way of paying for virus protection software. I have PC-cillin Internet Security 14 on my computer. If someone could link me to some great freeware that would be most preferable.

Thanks. Hopefully this can be resolved as soon as possible.

(I use Windows Vista)
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