How this happened is beyond me. We have anti-virus software running on all the computers in the house. For the record, we really thought CA, which we got through Cablevision at no extra charge, was the best. Unfortunately, it didn't work with Windows 7. I should really look into that now since Windows 7 has been around for a long time. I read recently that Windows 7 is pretty resistant to malware, but here's what happened to my wife's computer. A virus and a Trojan horse crept through Microsoft's own anti-virus program and hid her data files. We used malwarebytes.com to detect, quarantine and destroy the culprits. She's back in business. But she learned one valuable lesson:
Back. Up. Daily.