[paleghost]

I upclocked my cpu in steps a bit ago, and once it started to seem unstable I went back a setting. And I started to noticed problems so I slowly went back until I hit defaults where I still have problems.

This is what I have

Asus A8n SLI
AMD athlon XP 4400+
and the zalman heatsink
Zalman CNPS9500 LED heatsink/fan | silentpcreview.com
without the LED
550w powersupply
Windows vista SP1 (has this problem on both)

Here is my problem. I am getting white bars all over and flickering UI problems in games, and after a while, missing body parts, or flashing body parts. It seems if I boot up my PC after a 12ish hour break of being shut down, it's the worst. I am getting them all over the place now. examples.

http://img177.imageshack.us/img177/3049/cpu1or7.jpg
http://img187.imageshack.us/img187/9215/cpu2ia0.jpg
http://img210.imageshack.us/img210/3572/cpu3ew2.jpg

The animated icons on the right are making one flash across the text box.
It seems that once the pc is up for a while, windows doesn't get very many at all and I sometimes get the flickering in the games which I can fix by alt tabbing and coming back. But after a good amount of days with the pc being up I will start to get problems again. Here are the 3 things I have tried to do.

Reapply paste to the cpu.
reset cmos
Flashed Bios.

Is it hopeless?