Low FPS HELP ME PLEASE

[Wazaki]

Hey guys, i recently bought a new graphic card, a GeForce 7800 GS. My is :
system : microsoft xp professionel, version 2002, service pack 2.
computer: intel(R) pentium(R)4 CPU 1.80GHz 1.79GHz, 512 Mo of RAM
Graphic card processeur: Geforce 7800 GS
Memory: 256 MB
graphic card: GeForce 7800 GS
BIOS: 5.70.02.33.07

Now, for some reason my fps in game when iam walking arround in the server, is 30 if iam lucky. When iam in a battle its 10 to 15... I dont know why. Can someone help me, i already deleted CS:S and now iam reinstalling it.
Its pissing me off, i cant play with 15 fps....

 

[Wazaki]

Please, i tried downloading another driver, the beta one, windows xp, 32 bit. it helped a bit, its at high 20s now ehn iam walking arround . \
Stress test says i got an average of 43 fps. I asked one of my friends, he said i should be getting my fps in the high 80s wihtmy computer.

PLEASE, SOMEONE HELP ME!!!

 

[Saucey]

1) Defrag ur PC

2) Download caseys config and put into your config

3) Play in a smaller res.

Follow each step in order and if one works stop, or keep going to get more fps