Explorer caused invalid page fault in module unknown

Hi all,

I'm having a problem with a customer's machine. It's running Win98SE /
IE5.5. Initially the machine hung as soon as the desktop appeared and would
go no further. Booting into safe mode and disabling all none-essential items
in msconfig allowed the machine to start Windows, but opening My Computer,
Recycle bin etc caused

Explorer caused an invalid page fault in module unknown at 000:00000001.

The machine then hung and required a reboot. Since the machine doesn't have
it's own antivirus software (yet!) I've pulled the HDD and scanned it in
another machine. A few trojans were found and deleted, but the problem
remained. I've managed to install and run Adaware SE by running its setup
from a command prompt. It found a number of nasties including (from memory)
VX2, and duly removed them, but the problem still persists.

I've booted from a floppy and deleted the history, cookies and temp internet
folders, but that didn't help either.

Any suggestions would be much appreciated!

TIA,

Rob Ashburn.