Further to those suggestions.
I don't think you need a new mouse.
I read some time ago ( am looking for the article again ) of some bugs using a Logitech wireless mouse on a Vista with SP2 machine, where the OS occasionally ate the mouse drivers...only to rebuild them on next reboot.
Apparently a spasmodic event without any pattern or known reason, but the fact that you are up and running again now may indicate that that is what has happened.
Will try and find the article and post it here.