Those symptoms would seem to indicate that, somewhere along the way, you've 'lost' the drivers for sound and networking. Check in Device Manager, see if there's yellow exclamation marks against those devices. If that is indeed the problem, you'll need to download the drivers to another machine, stick them on a USB drive, then install them from that. Otherwise, I'd suggest a system restore - but I'm not sure that's a good idea in view of your recent history with the virus.
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