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Honestly, while most of what Martian says is true, when you asked whether its possible for a virus to 'hide' itself, it's not 'yes and no' - it's just plain possible. I'm not saying that is what is going on here, though.
The best, IMO, way to check your computer for viruses is to boot into safe mode and run a virus/adware scan. Some scanners won't boot into safe mode, and I've never used avast, so I couldn't say. Just try 'em all in safe mode.
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