After installing Security fix KB835732, the SYSTEM.exe
procress uses up 99% of CPU time, and make the system non-
responsive.
To unistall it, I did the following
(1) Boot into Safe mode.
(2) Run TaskManager - and noticed that the SYSTEM process
was using 99% of the CPU time.
(3) From TaskManager set the Priority of the EXPLORER
process to REALTIME, so that I can get to the control
panel.
(4) Run ADD/REMOVE PROGRAM from control panel.
(5) Go back to TaskManager and set the Priority of
MSHTA.exe to REALTIME, so that the ADD/REMOVE PROGRAM can
get some CPU time.
(6) Select and Remove "Windows 2000 Hotfix - KB835732".
(7) Go back to TaskManager and set the Priority
of "SPUNIST.exe" to REALTIME, for the uninstall program to
run.
(8) Wait a few minutes, and the uninstall program will
eventually ask you to click FINISH to reboot the machine.
It took a long time for the system to shutdown and I just
unplugged the power.
(9) The machine should become normal after reboot.