OK so the games not running? You could try updating your graphics card driver, make sure you have the latest version installed, if not then I'd say that could be the problem, always works for me when I'm experiencing trouble with games.
Go to the NVidia website and it should have the drivers for Geforce 5200.
Alternatively, you could try using the Omega drivers, which are unofficial but designed to offer more performance from games, they offer various tweaks and overclocking options. You'll find them
HERE
I should stress that they are unofficial, the safest bet is to always go with the official drivers from Nvidia, however I've used the Omega drivers in the past and had no problems at all.
Good luck
