Win 7 and XP no reboot

I can't install Win 7 64bit Ultimate because my box will not reboot. I got Win XP pro media center to install (after manual restarts) but it will not reboot either. Is it a Win thing or motherboard thing? I saw a thing on Microsoft about multicore reboot problems fixed with a hotfix but said it wasn't a problem with 64 bit Win XP.
Asus M4N98TD EVO
AMD Phenom II X6
XFX GeForce GTS 250
4 gig Patriot ddr3 1333
640gig WD sata
Plextor DVD sata
I would like to get Win 7 running so any help I would be gratefull.
Thanks
Brent

I'm not trying for a dual boot. I just can't get it to restart during install. I got XP to install after a little bit of force.But if I hit restart it won't. Win 7 wants to start over if I restart it manually durring install by hitting the power button.

Clean Install Windows 7

Try a full clean & full format.
Disk - Clean and Clean All with Diskpart Command
Partition or Volume - Delete
Partition or Volume - Create New
1) Boot DVD.
2) Press Shift+F10 (for command prompt)

Type in command line
DISKPART
LIST DISK OR List Volume (If you have partitions)
SELECT DISK # (win HD)
CLEAN ALL
CREATE PARTITION PRIMARY
SELECT PARTITION 1
ACTIVE
FORMAT=NTFS
ASSIGN
EXIT
EXIT

Check also for latest BIOS update.

What is your SATA controller setting?

Reset the CMOS: Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS

Have you removed all but 2gb of RAM to try install? Test your RAM and HD.

Bios update did the trick.
Thanks Guys