See if this helps:

Troubleshooting Windows 98 Startup Problems
http://support.microsoft.com/?kbid=188867

PattyL

"Denis Phelan" wrote in message
...
Upon start up I get the following error message:

Explorer: This program has performed an illegal operation
and will shut down.

Explorer caused an illegal page fault in module
explorer.exe at 015f:00401f31
Registers eax=00000000 cs=015f etc
etc.

Can anyone help?