wierd thing when I play stuff

[firespikez]

I play lotsa games with my pc, like everybody else. I shut down my computer the night, I bought another fan just in case, but now its getting a little choppy... Its just like a timer... I play games, its going perfectly 60 fps, and then, after a minute or 2, it goes 17 fps. then it goes 60 again after 3 minutes at least, and it goes on for hours... its pissing me of because I cant even kill someone in fps games, its too laggy. it does that with every game I play.
yes, I tried every single thing about graphics. even 600x800 does that. and I recently went to a proffesionnal and he said it was my internet. I started beleiving him when I noticed my ethernet driver wasn't installed. wich I did installed without success. (I CHECKED EVERY SINGLE UPDATE FOR MY COMPUTER)
can somebody help me plz?
components (or whatever its called)

GPU= nvidia 9600 gt
CPU= intel pentium D 3.00 ghz dual core (NOT A CELERON D)
Ram= 4 GIGS kingston memory (3.5 because of quota -_-')
p5l-mx mobo
d-link wireless internet card + (usb)
windows xp sp2
western digital 160 gb hard drive + 80gb
LG 20,1" wide (not really usefull information, just fun )

it does that with every single game I played so far. (garry's mod, half life series, team forteress 2... even pro street)

 

[umakemebetter]

#1 check your background tasks, run msconfig and analyze what automatically runs, research it on google, and tell us your results

 

[ssc456]

ok you say you added another fan right ?

now this may sound crazy but 1 extra fan mounted in the wrong place blowing/sucking in the wrong direction could actually increase your CPU/GPU temperature, try taking the fan out and see what its like then if its better try moving the fan or changing which way it blows

 

[firespikez]

I know. every fan I have blows (litteraly LOL) exept my cpu's

wow, I got usefull information about my d-link card:

"Solved: WZCSLDR2.exe
WZCSLDR2.exe is a running process on my computer that annoys the crap out of me. After my computer has been on for a while, this thing begins to eat upwards of 50% of my CPU usage. I don't know where it's from, but I have an idea that it came with my D-Link wireless network card software."