There are multiple viruses which identify themselves as svchost.exe. Usually they will go undetected from your installed antivirus program because they tamper with your virus definition file. One way to easily identify if you have it, is if you have multiple svchost.exe running, you should have one on a normal Win XP machine.
Both Symantec and F-Secure let you do an online scan, do that.
Also download hijackthis and run it.
Other good software is adaware and spybot.
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