i am currently running the free version of mach 3 for evaluation. so far it has crashed 2 different computers that both are running mach 3. both computers are AMD 64 bit computers with 1 gig of ram each. the computer i have setup to run my lathe is a standard 32 bit intel pentium chip that has 2 gHz. i'm wondering if this is an XP problem or a compatibility problem with the 64 bit computer. i will be buying software as soon as i get this figured out. thanks