Have you applied any compatibility settings to CFS3?
Running Win 7 on a dual boot 10/7 PC here and don't recall if I played CFS3 in Win 10 before adding 7 on an SSD (mainly to play BoB2 without issues) but - if only as it's a very easy thing to do - it might be worthwhile locating cfs3.exe, right-clicking on it, and in the menu which appears, selecting Properties/Compatibility, ticking 'Run this program as an administrator' and 'Run this program in compatibility mode for:', trying different values in the drop-down - I have Windows XP (Service Pack 3) compatibility set.