Hi,
Here are 2 Microsoft Knowledge Base Articles that may help with your issue.
"It is Now Safe to Turn Off Your Computer" error message when you try to
shut down your computer
http://support.microsoft.com/default.aspx?scid=kb;en-us;810903
How to Troubleshoot Problems with Standby Mode, Hibernate Mode, and
Shutting Down Your Computer in Windows 2000
http://support.microsoft.com/default.aspx?scid=kb;en-us;266169
Also you may want to confirm that you have the latest Bios Revision
and Chipset Drivers for your motherboard.
Please consult you motherboard vendor's website for updates.
Kenneth C. Engelhardt
Microsoft Online Support Engineer
Get Secure! -
www.microsoft.com/security
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Let me know if you have any other questions or if I can help.