I had problems initially with Win 7 64 bit, and ended up saving wanted files to another drive, then completely re-formatting HDD and re-installing everything, since, (touching wood, throwing salt over my shoulder with toes and fingers crossed) it has run fine, but if I open another program I find RB map will freeze or has frozen, and I'm unable to do anything until I shut down completely and re-start machine - there's something with RB that 64 bit Win 7 (or vice versa) doesn't like or find compatible, and yes, RB has its own separate folder under C: "AirNav Systems" PITA!