Actually, Megabot's right on the money there! Msconfig is the place to go to stop Audiogalaxy from loading on startup. Tell us how you go!
As far as the virus goes, if you're sure it's a virus, then a virus checking software may be worthwhile. Otherwise, format and rebuild and you'll get rid of all your problems.
I rebuild my PC about once every 6 months just to clean it up. It helps to keep everything running smoothly, and gets rid of any problems (like the ones you mentioned)
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