>>This is worse than I thought. All four PCs are hosed. This from the Mac, the only computer that will connect to the internet. The PCs are all reporting viruses. Worse, my backup drive got dusted. All my work, all my finances, everything gone. You may not see me for a while.
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>Ouch. You might want to think about professional data recovery services e.g. Kroll OnTrack: http://www.ontrackdatarecovery.com/

Thanks, Al, I will check that out.