windows locks up durring startup

[joe]

whenever i go to up win xp pro with sp1, my system hangs.
when i try to start into safe mode, the computer always
stops on the file "mup.sys". Does anyone know how to fix
this problem without reloading the entire operating system?

 

[Rich Barry]

Joe, try removing your PCI cards one by one to see if it corrects the
problem. Also, check here
http://www.annoyances.org/exec/forum/winxp/t1047532372