Sorry to hear about your computer problems. I had a similar experience with Paypal, ended up with my account being blocked for a couple of weeks in case I had been cheating the other party. I wondered whether it was a scam of some sort. Paypal were not helpful either.
But at least it did not have the same effect as yours. So sorry your computer got badly infected. We are running the free Avast Antivirus programme and, touch wood, that seems to have kept us safe so far. There are other free, good antivirus programs you may think about loading when your machine comes back.