I don't have any problems with Windows 7 64 bit. I did need to chase up a Video driver though. You will need OpenGL2 for Stellarium and that may be a problem with some cards. What is your video?
My biggest trouble was all the compiled Qbasic programs I have for astronomical calculations. They don't run on 64 bit. However I found QB64 a c++ shell for Qbasic that now runs everything better than ever.
I did have to rewrite the com port access, change the hot key method, make Functions (subs) out of DEF FNx(x) and change some reservered words but now they run perfectly on both Qbasic and QB64.
I thought TheSky 6 and X used direct X rather than OpenGL. I must check that out.
Barry
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