Because it uses DirectX 9. I got Madden NFL 07 to run on Windows 10 Pro x64 ver 1607 by downloading (Dege's Thank You by the way) dgVoodoo2_53Win10 Link http://dege.freeweb.hu/ 3Dfx folder copy and paste the 3 dll files Glide.dll, Glide2x.dll, Glide3x.dll into Madden 07 main install directory. Works perfect. note dll's in the MS directory wouldn't work. Run from the mainapp.exe