Hi my XP Pro system got the mup.sys error just out of the blue today. Here's what I did:
1. Ran XP setup and logged onto my C:\windows
2. EXPANDed the d:\i386\mup.sy_ file to C:\windows\system32\drivers folder
after a failed reboot or two I then followed the advice of whoever wrote about pulling out their mouse lead during safe mode boot.
I was running a Logitech cordless mouse off that system at the time and I did the following to get XP to boot successfully:
1. made sure ACPI, Plug & Play, USB all enabled in BIOS
2. moved mouse from the ps/2 port to the first USB port
3. booted using safe mode
4. waited until it hung at Mup.sys
5. removed the mouse cable from the USB port
6. (3 seconds or so pass, the screen went black and safe mode appeared)
7. restarted system
8. booted normally into XP Pro
job's a goodun', thanks to that poster!
Thanks all
Adam
Found On **broken link removed**