You may get the UNREGMP2.EXE - Entry Point Not Found Error Message error when you upgrade Windows XP Home or Windows 2000 to Windows XP Professional. You may also get this message if you try to repair Windows XP Home or Pro. Another part of the message may say "The procedure entry point getIUMS could not be located in the dynamic link library msdart.dll." Clicking on the error message appears to do nothing and the message just reappears each time.

This is caused by having a newer version of Windows Media Player installed on your previous Windows installation than what Windows XP comes with by default. When you try to upgrade or to repair Windows, the Setup program will try to install an earlier version of Windows Media Player in addition to the newer version that you had previously installed. The installation will then generate the error message and stop. This usually happens when you try to install from a Windows XP CD that does not contain any service packs.

There are a few ways around this message and they may or may not work for your situation. One thing you can do is click Ok until it goes away. This may require you to click Ok 200 or more times for it to work. Or you may get lucky and only have to click it 50 times or so. Holding down CTRL while clicking may give you better results.

You can also try to use Task Manager to close the error message. To do this, follow these steps:

  • Press SHIFT + F10 to open a Command Prompt window.
  • Type taskmgr.exe and then press ENTER.
  • Click the Applications tab.
  • In the list of tasks, click the error message entry.
  • Click End Task.
  • Then Quit Task Manager.
  • Close the Command Prompt window

OR

  • Click the Processes tab.
  • Click unregmp2.exe in the list of processes.
  • Click End Process.
  • Then Quit Task Manager.
  • Close the Command Prompt window

You can also try to press CTRL+SHIFT+ESC to bring up a Task Manager window.

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