Hi Marius and thanks for your response.
After I posted I continued to work on the problem. After reading many other threads, I downloaded the Kaspersky Rescue disk onto a clean computer and started my infected computer with it. Not having seen your instructions, I did run the Kaspersky scan, but it found nothing. I then used the Windows Unlocker feature and was able to unlock Windows and get to my desktop. I knew that the FBI virus was still there.
I downloaded Hitman Pro and ran it, it found a bunch of stuff which was deleted.
I downloaded and ran RKill which also found some things, but I'm not sure how that application worked.
I downloaded and ran Malwarebytes AntiMalware, and it found nothing.
Since then (about five days now), Hitman Pro has been running on my machine and has found nothing.
Everything is working perfectly.
Should I do anything else?
Thank you for your help.