The Problem

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I am haveing trouble with speed on my PC.When I played a game like Half-Life,TFC or C.S I get a very shakey FPS of 15-71.Before this I was getting a very steady 71.The shakey 15-71 fps causes a kind of lag.Another problem that I have noticed is that opening folders or pragrams take alot longer to open.
At first I thought the FPS problem was caused by my graphics card but the other problem of programs opening......well I think its RAM there.
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What I have done to try and fix this problem
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Graphics Card:
1. I have tried reinstalling the software
2. I have downloaded the latest drivers for it
RAM:
1. I have opened my computer,removed the RAM and put it back in again
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The Computer
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Pentium 3 500 MHZ
256 MB of RAM
GeForce 2 MX SDR AGP 32MB graphics card
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What the hell is wrong?
Please help me

Thanx





