I play some older PC games on my computer:
X-wing Vs. Tie Fighter
Sonic 3D Blast
Sonic R
And the trick I use if some games don't want to work is:
Right-Click the game icon
Do Properties>Compatibility Tab.
Check "Run this Program in compatibility mode for:"
Select from the Drop Down Menu -Windows 98/Windows ME (Or Windows 95 depending on how old the game is)"
Check - "Run in 256 colors"
Check - "Run in 640x480 Screen Resolution"
You shouldn't have any more problems running old games after that. A lot of old games have problems with not running in 256 colors and some have trouble with not running in 640x480 as well.