The games are 100% updated and legitimate, no Pirating for me, thanks.
The ones I play the most are Team Fortress 2, and Counter-Strike: Source, both on high settings with x2MSAA and x4AF. Vsync is always enabled so I usually get 60FPS all the time in both games, until just recently.
I did however just install some new RAM, and upgraded to Windows 7 64-bit, to take full advantage of all 4GB's.
I have not defraged yet either, do you think that could help?