Started yesterday. When I turn machine on it starts normal with one beep and then starts scrolling normal start info, but before scrolling is complete the process locks up. HD is not running when it locks up. I manually shut down and restart, and system boots into mode choice screen. If I enter normal start it recycles to same screen. If I choose one of the other modes the system runs a driver check and stops at ..multi(0)disk(0)rdisk(0)partition(1)WINDOWS\system32\drivers\Mup.sys...every time. After a few off/on tries the system will boot into the checking file system screen, which I let run to the end. System then boots through the normal startup process. The disk sector it references is 1848-16F8.
System is running XP Pro SP3 with all updates and IE8.
AMD Athlon 2500+ with 1 GB RAM, Gigabyte Radeon 128 video card and an ASUS mobo.
Once started system runs normal. System is protected by Norton 360, fully updated.
I have the original XP program disk, but am not sure it is an error in the start-up program. Can someone help diagnose the problem, and recommend what I need to do to get back to normal operation. I have backed up all the data.

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