It's hard to diagnose a problem like this remotely, but I think you may have a few ideas. In light of the virus activity, I would try using something other than Windows utilities to delete the partitions. My favorite tool is Partition Zapper ( http://www.meixler-tech.com/pzapper/), but others are available. If this doesn't solve the issue, try checking the cable connections between your motherboard and your IDE hard drive. The final solution is of course just replacing your hard drive, which may have failed outright.
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