CPU, GPU, or Windows

I have built a new old system. it is a socket 754 system with parts mostly from around 2006, but most of the parts I just bought.

Motherboard: Gigabyte K8VM800 V2.0
CPU: AMD Athlon 64 3200+
GPU: ATI Radeon X1950pro
RAM: Corsair DDR3200 2x1GB

I cannot quite figure this one out. The system was built for playing some older games I love, since Fallout 3 will not work under Windows 7 and some other games have a lot of trouble working with Windows 7. I have tried both Windows XP Pro 64-bit Edition and Windows XP Pro and both are having trouble. The 64-bit had constant freezes while installing some programs and forced me to restart. I had the system lightly overclocked, raising the FSB to 220 and the CPU clock rate up from 2.2 GHz to 2.4 Ghz. The first thing I tried was to restore Bios defaults and try but that also did not work. So I installed XP pro 32-bit and restored my overclock. It has a few of the same issues, so I lowered my RAM frequency to 166 since it had also been overclocked when I changed the FSB and that fixed some of the problems.

I have also tried changing out the PSU with a 575w unit, since I originally had a 300w unit which I thought was a little light. The system still freezes whenever running some installation wizards and when using anything 3D. I have a x800pro I am going to try and see if that works if maybe it is just the x1950pro. All of these parts are new/used and bought recently except for the motherboard and RAM which I had from an older build.

Any ideas would be appreciated.
 
No body said a single word, get kind of tired of that but owell.

I have found what seems to be the problem so I will post it encase someone else has similar problems.

It seems to have been two problems. By raising my FSB I pushed my RAM too hard which caused most of the problems. By decreasing RAM to 166 and dropping the timings so it keeps similar performance (final FSB for the RAM was 175) all of the problems outside of games seem to have vanished.

Inside of games the system still freezes and crashes and appears to be that the old HIS IceQ3 X1950pro I had installed can no longer handle 3D, as even with clock settings for all parts set to default it could not run properly.

Good news is that the x800pro, despite being lower than the minimum recommended gaming card for Fallout 3 can play Fallout 3 just fine. On low settings at 1366x768 resolution. Keeping AA and Bloom/HDR off I made it all the way to High settings before it dropped and was constantly below 30. So a mix of medium and high settings will let me run the game with bloom. :)