I use SatPC32 since many years - now, since about 3 months on Windows 8 (both 32bit and 64 bit) and no complaints !

I have however learned to run the program as Administrator (set the corresponding flag (properties / compatibilty / )) , so that SatPC32 can control my rotor interface (Winrotor) which is a separate program

73, Werner, HB9BNK