Make sure APIC is enabled!
For troubleshooting purposes I would put the SATA drives back in IDE mode.
Also, disable virus protection in BIOS.
You shouldn't be overclocking.
kind of shadowing or caching options.
Set your memory timings to auto if they are manually set (let the MB get the timings from SPD)
Make sure your CPU clock speeds are accurate to your CPU.
... Okay, i just trudged through the worst website known to man (asus.com), and grabbed the manual...
Turn off AI in the jumperfree config, thats an auto-overclock thing and it can cause issues.
Make sure plug-n-play os is set to yes.
As long as everything else is at its default settings, I dont see why this would be happening....
Run memtest86+ and see if it errors out. http://www.memtest.org/