My computer started having fits last night, first with Lavasoft alerting about changes to registry keys (all of which I blocked). Then games like solitaire and hearts became unable to open. When I went to Start/Programs/Games to open them, the icons were gone/replaced, and the file extensions were changed to .lnk. Then it started to cascade to other programs, so I shut the system down. I had Norton AV, but the script had just expired yesterday, and I was in the process of renewing it when all this happened. Norton AV is now also a .lnk extension. What is happening? And how do I fix it? Thanks!