XP Pro shutdown issue

[Racer7201]

Just got a new 'puter and installed a fresh xp pro sp2 system. The system will hang at shutdown if the printer or anything else (external cdrw or harddrive) is connected to the usb ports. If i turn the printer or other device off or unplug it, a few seconds later xp shuts down. It correctly identifies anything i connect to the usb port. Looking for suggestions? I'm still searching for answers.
Thanks

System:
Asus P5N-E-SLI
Core 2 6750
2g memory
320g sata
Sata DVD burner
IDE CDRW burner
Media card reader

External Sony CD/DVD burner
External Hard Drive enclosure
HP Officejet all-in-one printer