Specs _______ 2.0 GHz AMD Athlon XP 512 DDR PC2700 RAM (Ordered 2 sticks of 512 PC3200 RAM off Newegg to Upgrade My RAM) Geforce 6800 (Unlocked Pipelines) Windows XP This is a very serious problem and its getting on my nerves. This started happening after I got my videocard and then I formatted my one and only C: harddrive. I upgraded from a Radeon 9600, and I reformatted after I got my new videocard for a clean start. None of my PC parts are overclocked. The only adjustment made is to my videocard, which I unlocked 4 pipelines (12 to 16). But with them unlocked or without them unlocked, the problem persists. The problem also exists for every driver I tryed. It can't be the power supply because It's a complete new 350 W with everything correctly plugged in. I even reconfigured it twice. And Yes, this power supply is good enough to support my card and peripherals. Here are games i've discovered not to work and restart a minute into play or restart as soon as it starts: Thief : Deadly Shadows (Rarely) Metal Of Honor : Pacific Assault (Uncommonly) Half Life 2 And Other Source Based Games (Counter Strike Source restarts, but its not as common as it is for the others). Here are Games I played lately that run fine and don't restart : Farcry Farcry "The Project" Demo Doom 3 Splinter Cell : Pandora Tomorrow Halo I don't know whats causing this problem, it would help enough if someone identified it atleast so I could solve it myself. This is a very serious problem and its extremely frustrating. I really want to play Half Life 2 and Counter Strike!