I remember this problem being solved before on the list but have been unable to find it in the archive. What does "Ungultige gleitkommoaoperatioin" mean? I get this on startup after a new install of satpc32 on the Windows 8.1 side of a dual boot 64 bit machine. Satpc32 is running fine on the Windows 7 side of this same dual boot. Bob, k4vb N ALA