Hey all - only solution I've found is to use a SATA hard drive. I tried 3 windows operating systems on 4 IDE hard drives, they would all install then refuse to get past initial load screen on the very next boot. Judging by forums i looked at to try and fix this, I can tell you 3 things:
1) The marvel IDE controller seems incapable of running an OS on the IDE connection
2) SATA hard drives have no problem and work quite well with this MoBo
3) The IDE issue is widespread enough the ASUS knows about it, but they aren't educating their IT people about it...
Yeah, you can try flashing and updating bios and hoping you get it fixed... and possibly jack up your motherboard. I recommend getting the cheapest SATA hard drive you can live with - it's an easy and effective fix.
P.S. - I'm an aerospace engineer. Yeah, rocket science. It took me, a computer science major and two electrical engineers (not to mention all the people I called at ASUS, Micro$oft, etc.) two weeks of bashing our heads on this before I gave in and bought a SATA drive. Save yourself the trouble.