Windows XP Pro will not shutdown on my system. It reboots instead. My system is Abit KT7A MB, 256MB Ram, WD Expert 20GB and WD 10GB drives on Promise Ultra ATA 66 controller. My HP CDR-CDRW and Pioneer CD drive are on the MB controller. Occasionally, wants to reboot to the D: drive(10gb)which has Windows 98 on it. What could be the reason?