Question : Problem: Stubborn Computer wont turn off

My computerwill not turn off. It's a windows 98SE, but it wont turn it's self off.
Doe anyone have any suggestions.

Answer : Problem: Stubborn Computer wont turn off

Here's the list:

Maxtor/Quantum http://www.maxtor.com/en/support/products/index.htm
Fujitsu http://www.fcpa.fujitsu.com/download/hard-drives/#diagnostic
Samsung http://www.samsungelectronics.com/hdd/support/utilities/utilities_index.html
Seagate http://www.seagate.com/support/seatools/index.html
Western Digital http://support.wdc.com/download/
www.westerndigital.com
IBM and Hitachi http://www.hgst.com/hdd/support/download.htm#DFT