I think this is because it is 16bit exe, and Compatibility tab should appear for 32bit apps only. I thought KernelEx affects only 32bit apps... Freecell is 16 bit? Well, it did run on Win3.1, but you needed the Win32S package. In fact that's how you confirmed Win32S installed correctly. Aren't there two different 32 bit .exe formats? Maybe Freecell is the older one.... Anyway, since it works on others' PCs, and it doesn't have a compatibility tab, I'm thinking the problem must be a conflict with something else, such as the display driver perhaps. (I did try a couple different display resolutions, and both 24-bit and 32-bit color, but it didn't help.) I have a Matrox Millennium G200 display card. Anyone else have that card or something similar?