No Games running on vista.

I did kno vista wasnt the best choice, but it was my only choice for my laptop. After putting on some basic games like NBA Live and Dynasty Warriors, it wasn’t much of an issue. But for the past two weeks, they just dont work. They get to the actual game portion or sometimes the menu screen and just crash. I installed dynasty warriors 6 and it crashes also. Any ideas on what to do?
Answer #1
Check temperatures, make sure ventilation points aren’t blocked, re-install drivers (graphics first, most likely), re-install games if all else fails.