Windows XP just restarts on Windows Xp loading screen and Safe mode hangs on Mup.sys – Safe mode stops on Mup.sys – safe mode automatically reboots a few seconds after Mup.sys

I had this problem on a windows XP machine and I trawled the forums and web pages looking for fixes for the solution. I will list some of the fixes that people suggested. These did not work for me but there is no reason why might not work for you. Then I will list my solution to the problem. You will need to be reasonable level of proficiency with computers to attempt some of these fixes. Before trying anything please read our disclaimer at the bottom.

Option 1. – Try a different power pack

It has been suggested that this error can be caused when new hardware has been installed where additional power is required or the power pack is losing its ability to run the computer. Although this has been the fix for others, I dispute its validity. It’s worth looking at to cancel out all potential issues.

Option 2. – Run Chkdsk /p in the windows xp recover console

Option 3. – Reinstall Mup.sys file from Windows XP CD.

(where d: is the letter of CDrom drive)

Option 4. – How to recover from a corrupted registry that prevents windows XP from starting

To do this it’s best to follow the Microsoft’s guide.

The steps involved are:


If after following inserting the clean registry files you still cannot boot to safe mode there is a serious problem with your XP install (which was my case) Follow the next part :

Option 4a – reinstalling windows over the top reload old registry files. (Solution to my problem)

Before you go through these steps you must have followed Microsoft’s guide and created a backup of the registry files. You will have them located and names as follows if all is correct:


Ok so we can start.

Putting back the old registry will likely bring back any viruses/spyware and malware that may have caused this issue in the first place so virus cleaning, registry cleaning will all need to be performed afterwards.

So to put the registry back :

del c:\windows\system32\config\sam
del c:\windows\system32\config\security
del c:\windows\system32\config\software
del c:\windows\system32\config\default
del c:\windows\system32\config\system
copy c:\windows\tmp\software c:\windows\system32\config\software
copy c:\windows\tmp\system c:\windows\system32\config\system
copy c:\windows\tmp\sam c:\windows\system32\config\sam
copy c:\windows\tmp\security c:\windows\system32\config\security
copy c:\windows\tmp\default c:\windows\system32\config\default

When Windows loads you need to get on the case and install Antivirus software, antispyware, windows updates and registry cleaners. Some other pieces of software that you previous had may have problems so they may need reinstalling. But fingers crossed most should be ok.


Good Luck

Disclaimer: By using any of the software mentioned in this document you are adhering to their terms and conditions of use. I do not accept any responsibility for any loss, damage or disruption to your data or computer system that may occur while using the software mentioned in this document.
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