When I start Windows 98, I immediately get an error
message telling me Explorer has performed an illegal
operation and will be shut down. The details a

EXPLORER caused an invalid page fault in
module IMSHELL.DLL at 0167:1001790c.
Registers:
EAX=01427c44 CS=0167 EIP=1001790c EFLGS=00010246
EBX=00000000 SS=016f ESP=0141f82c EBP=01427c78
ECX=01427c44 DS=016f ESI=00000003 FS=21bf
EDX=00000006 ES=016f EDI=00000000 GS=0000
Bytes at CS:EIP:
66 8b 02 83 c2 02 3a 01 75 ce 0a c0 74 c6 3a 61
Stack dump:
1000a6f9 00000006 01427c44 bff92d08 00000094 00000000
0000000c 00000008 00000003 00000000 d82be2b0 11d05764
c0006ea9 a205d74f 001c0022 0000010a


Any ideas? I think the problem has been since I was having
problems with lots of pop-ups and installed Ad-Aware... I
tried one of the 'free scans' to check for DLL problems
and it brought up lots, including the fact that
isshell.dll is missing, which I guess might be related?

Anyway, any help would be much appreciated (my email
address just needs the REMOVE removing).
Thanks in advance
George Norton