Updates will not install after upgrading XP home to XP pro

Here is an interesting issue I have seen occur multiple times.  Basically the problem is that after running a full upgrade from Windows XP Home to Windows XP Pro, the updates will not install.  Automatic updates will download all 70+ updates and go to install them and one by one they fail immediately.  When you go to the Microsoft update site you cannot even install the windows installer and GDI required updates.


From what I have seen is the issue occurs because there are a handful of DLL files that do not re-register with Microsoft’s server and therefore will not allow you to install the XP Pro updates to your computer.  .


When I first saw this problem I spent a couple hours trying to figure out what was going on.

  I looked to make sure all my settings were correct and that I had not missed some checkbox or selection somewhere in the process of installing the upgrade.  I even went through the process of re-installing the upgrade which all turned out to be a waste of time.


After searching the web for some time I came across a solution that fixed it in under five minutes for every machine this happened to.


Basically, you have to manually re-register the DLL files related to the updates to get it to work.  Here is how it’s done.


  • Open the start menu and go to the run command.
  • In the dialog box type “cmd” without the quotations to open up the command line
  • Then type in these commands in order:
  • net stop wuauserv
  • regsvr32 wuapi.dll
  • regsvr32 wuaueng.dll
  • regsvr32 atl.


  • regsvr32 wucltui.dll
  • regsvr32 wups.


  • regsvr32 wuaueng1.dll
  • regsvr32 wucltui.dll
  • regsvr32 wups.


  • regsvr32 wuweb.dll
  • regsvr32 wups2.dll
  • regsvr32 msxml.dll
  • regsvr32 msxml3.dll
  • regsvr32 msxml2.dll
  • regsvr32 qmgr.dll
  • regsvr32 qmgrprxy.


  • net start wuauserv
  • After you have put each one of these in it will pop up with a box saying that they have registered successfully
  • Run updates again and they should start installing
  • I have linked a batch file on my website to run this automatically so you don’t have to do it by hand.

    I have professional IT experience in troubleshooting and maintaining Windows networks and workstations for over two years. I can setup networks small or large and create secure systems for wireless or LAN networks. My skill set is deep and I have a very good working knowledge of computers and their components including hardware and applications. For more information on computer issues or if you would like to find an answer to your computer problems visit my site now at Computer Revival. Thank you

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