Computer acting slow all of a sudden


Aug 23, 2009
For the past few days, my computer has been acting slow. I believe my computer is a "decent" computer but whenever I start up a simple game such as counterstrike 1.6, I get so much lag. I tried to see if it was the game itself thats the problem by playing other games, and turns out that it all lags. I tried restarting, deleteing some files that I downloaded before, scan for viruses, nothing.
Please help!

AMD Athlon(tm) 64 X2 Dual Core Processor 5000
2.59 GHz
3.2 GB Ram
Nvidia GTS 250
have you checked for malware or spyware? i see you've checked for viruses but not the others.

also, have you done a defrag of your computer HDD? fragmentation on the HDD can slow the computer down.

Although i doubt fragmentation this would be the case as it sounds like to me something software related as hardware normally doesn't do thing suddenly like that.

My last question will be, when computer posts (if you see it), what speed do you see the cpu at? it should be 2.6Ghz.