You have my sympathies. Did you by any chance download some automatic updates from MS? My XP machine started to yesterday then for some reason restarted the process again this morning. It's "that time of the month"
Although I'm pleased to say Env is still behaving itself here but obviously with different hardware anything's possible.
I'd consider uninstalling the latest updates if that's happened.
After uninstalling, did you check the registry for any Cadsoft entries?
Anybody got any ideas how to completely remove Envisioneer to do a clean installation again?
I was happy yesterday, everything was going well. I woke up today and EV didn't work. So I am sad now.!