Gee Kelso I agree must be really frustrating, I can't understand it at all. I've used Biab for many years with XP and a variety of mice and never had that problem and coz your problem only happens with biab it is a strange one.

As Matt said maybe PG with all their experience can throw some light on it. I guess it could be a combination of bios/graphics/driver problems. How old is your PC?, Which DXI are you using?

I did have one strange W7 problem [not mouse related] at one time that was cured for some reason by updating the graphics card driver which PG suggested.
Anyway good luck keep us informed.
Jeff