Win 98 Shut downs

Are you expierencing any overheating problems this will cause the restarts
Check memory to make sure that it has not creeped out of the slot
update the video driver
Check the power management settings and also find fast.
Scan the system for viruses and recheck the anti-virus configuration

If the Win patch did not fix the problem, you are going to have to troubleshoot the problem at the motherboard level. There is not enough information given in the question because the problem usually is in the way the Power Management on the Motherboard interacts with the OS.
Although this is supposed to be standard, there are differences between motherboards.
(The MB is seeing a false restart command from something.)
As a result.
The exact make, model, and version of the motherboard are isthe minimum information necessary to start troubleshooting.
(I am assuming that the PC is otherwise properly setup.)
Regards, Chris

Try out this option and see.In the Start "RUN" menu give "msconfig" then click on ADVANCED in the GENERAL MENU.Then select "Disable Fast Shutdown" and say all ok's.

Step by step here .
http://www.aumha.org/a/shutdown.htm

If software won't do it, there's always the hardware shutdown: move power switch from ON to OFF. If this doesn't work, pull the plug.

I just went fixed a similiar problem on my network and it was Norton AntiVirus 2000 causing a shutdown problem even after the MS patch. I unistall NAV2000 and everything worked fine. I recently upgraded my AV to Innnoculan with no problems.

Create a shut down Icon
Browse to c:\windows\rundll32.exe
click ok add " exit,windows" (no spaces between exit and windows)
"C:\windows\rundll32.exe exit,windows"

If that does not work use Ctrl-alt-del and delete tasks one at a time until you find the app that is hanging your shut down

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