You should have access to the recovery console, correct? If you do, login using that, then when the prompt is ready, and you are logged in, type "disable mup". The odds are, most consumers will never ever need that process, because all it does is communicate with Netware server.
If that doesnt work, and it hangs on something else, go into your CMOS and disable damn near everything non-critical(onboard audio, USB, UDMA access, etc). Then login again from recovery console and do a chkdsk on the volume. If it finds errors, a recovery/repair installation may be necessary.
For the record, what is your chipset?