HL, HL2, and CSS BSOD

[Beelzebub123]

i litterally just installed the games mentioned in the subject and when i try to start any of the games i get the BSOD(hence the angry smiley) and the error message that i see is
"STOP: 0x0000008E (0xC0000005, 0xBFA6CC34, 0xB99D4B48, 0x00000000)

NV4_disp.dll - address BFA6CC34 base at BF9D3000, DateStamp 42f00bcd"

i restart the computer and a window pops up saying windows recovered from an error and the click here for more info says
"BCCode : 1000008e BCP1 : C0000005 BCP2 : BFA6CC34 BCP3 : B99D4B48
BCP4 : 00000000 OSVer : 5_1_2600 SP : 2_0 Product : 768_1 "

then i click the view more technical information thing
"C:\DOCUME~1\Owner\LOCALS~1\Temp\WERd680.dir00\Mini101005-05.dmp
C:\DOCUME~1\Owner\LOCALS~1\Temp\WERd680.dir00\sysdata.xml "

i have a Compaq Presario S5322CC
768MB RAM
GeForce 6200 oc 256MB
just ask if you need more info

 

[Beelzebub123]

it was overclocked when i got it and it works fine with my other games (BF2, Black and White 2, UT04)
do you have any suggestions on how to fix the problem, i have no idea on how to change the clocking so thats out, unless you tell me where to get a guide