problem when shutting down

when going on to the 'start menu' and onto shutdown on wndows 98 the
follwoing message appears and stops us from shutting down:

EXPLORER caused a general protection fault
in module <unknown> at 0000:0000094f.
Registers:
EAX=ffdfffdf CS=0447 EIP=0000094f EFLGS=00000282
EBX=00000002 SS=042f ESP=00000040 EBP=00000004
ECX=001f001f DS=2957 ESI=00003cc4 FS=6a57
EDX=04470934 ES=2097 EDI=04000038 GS=0000
Bytes at CS:EIP:
26 89 07 83 c7 04 8b 06 83 c6 04 8b c8 d1 e0 25
Stack dump:
00000000 854a3bbf 00000000 00000000 00000000 00000000 00000000 00000000
03020100 07060504 0b0a0908 0f0e0d0c 03010200 07050604 0b090a08 0f0d0e0c

the message also appears when onto my documents and (C. Is anyone able to
help? Thankyou