PC slow down while playing games and watching online animations.

[Neophiiit]

Hi there all.. im a Hobby shop owner and we just bought 4 computer so we can LAN. The problem is that everytime we try to play a game the computer slows down during then game and then starts working fine then slows down then fine ..... etc.... etc..

At first i tought it could have been caused by our router ( network ) but the same thing happens even when we play single games off the internet.

Here are the machines we using:

Windows XP pro SP3
Motherboard: m2n-mx se plus
Processor: AMD Athlon(tm) 64x2 dual 6000+ 3.01GHz
RAM: 2.00
Graphic card: eGeforce 8600 GT

so far we tried those games:
- Rainbowsix VEGAS2
- Age of empire III
- Starcraft 1

The fact that its slows down even while playing the 10 years old game Starcraft make me think that it is not an hardware problem. But im not an pro.

I already tried to:

- Uninstall Windows SP3
- Update my graphic card drivers
- Install AMD Dual-Core Optimizer
- Close every other application during gaming.

Nothing worked...

I hope that someone could help me with that problem !

Thanks alot

Neophiiit

[dai]

what power supply
brand
wattage
post what the bios lists for tempretures and voltages