Windows hangs on MUP.SYS in safe mode

Posted on 2009-05-01
Last Modified: 2012-06-27
Windows hangs on MUP.SYS
I have a Windows computer that won't boot, it just restarts after showing the Windows startup logo.
When I go into safe mode, it hangs or stops after loading MUP.SYS.
How can I try to repair it with out reloading the OS, Programs, and data?
Question by:peveler
    1 Comment

    Accepted Solution

    I experienced this problem several times.
    I fixed this problem by doing the following steps.

    Remove and install the crashed hard drive, as a secondary drive, into a working XP or 2K computer.
    Start up the working computer and let Windows discover and install the secondary crashed hard drive.
    After doing this I went into explorer and saw the crashed drive and noticed it was installed as drive E:
    Now explorer might assign a different drive letter to the crashed drive, depending on the number of drives you have in your working computer.  Use Explorer to identify the crashed drive letter assignment.
    When I clicked on drive E: to browse it, Explorer came back with a frightening message, saying drive E: is not formatted, do you want to format it now.  Of course the answer is no, which I advise you not to do.

    I repeat, do not format the Drive E:

    I exited explorer.
    I opened a command prompt.  Start,Run, Cmd, enter.
    From the command Prompt I ran chkdsk e: /f,   e: being the drive letter that Windows assigns to the crashed drive.

    At first, chkdsk ran slow and found about 20 innaccessible sectors, which once again frightened me. ( I have a kind and weak heart) but it eventually sped up and fixed bad areas of the hard drive.

    When chkdsk finished, I restarted the computer.
    I went into Explorer and at this point I was able to browse drive E:
    I copied the My documents folder, the favorites folder, and other data files to the good drive C: so that I could have a data back up of the crashed drive in case I have further problems.

    I removed the crashed drive from the working computer and installed it into the origanl computer, and Windows started just fine.
    I advised the owner that they should backup their data files, and replace the hard drive because it may be going bad.

    I also used this same method to access a crashed RAID controller drive.

    Good Luck
    P.S.  I asked and answered my own question here so that I could share this method with my fellow experts

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