Well i did not come across any problem like this before on this board.
I will suggest you to do a test if possible.
1. Back up your information to a separate media
2. Do a CMOS clear for 10 -15 minutes.
3. Leave the system with minimum configuration like single hard drive, optical drive, single memory module, no graphics card
4. Go into the BIOS
5. Set the BIOS to default F9 and F10
6. Insert your OS cd (if you are using Windows XP, try to get one with SP2 embedded)
7. Boot on the OS.
8. Format the drive
9. Install a clean and fresh OS.
10. Once OS is installed, install the drivers from the website in the following order.
Let me know if there is any difference. Dont connect any device on the front panel. Connect all the devices thru the backpanel.
All the best,