When i try to launch Half Life 2, HL2DM, CS:S, DOD:S i get a crashing error every time:

AppName: hl2.exe AppVer: 0.0.0.0 ModName: shaderapidx9.dll
ModVer: 0.0.0.0 Offset: 0002e5fa

I have reinstalled DirectX 9.0c, Sound Drivers, Video Card Drivers, BIOS

I have formatted my computer, I have reinstalled windows, i have reinstalled all of the above games as well.

Heres my current config:

AMD 3800+ Dual core
2 gigs corsair ram
BFG Nvidia Geforce 6600gt oc
ASUS A8V-MX Mobo

I have even tried downloading and installing the Nvidia BETA drivers as well.

Judging from the error it seems like a DX9 related issue, but all of my other games play fine, only those dont work.

I have tried everything over quite a long time period and still no success. I used to play this fine on the same system until i messed up my directX then i reformatted and it wont work.

I have checked Valve Customer support, ASUS, Nvidia, ect.

If there is anything anyone knows the help would be appreciated, i go nuts when stuff wont work!

Thank You everyone in advance.

is it just source games it does it for?