regcon.exe hangs

I am having problems with system not shutting down. I
disabled all the startup programs, reset BIOS defaults,
checked drivers and set the power scheme to always on. I
have windows XP home edition. Is there anything else i can
do except going in for a reinstall. I cleared all the
event logs and tried to shutdown. When i started the
system back on the only error message under the
application section of the event viewer is regcon.exe has
caused an application hang.