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The program must close to allow a previous installation attempt to complete

For some really odd reason, a recent Firefox update on my Windows Vista computer resulted in the following error message when attempting to launch the program “The program must close to allow a previous installation attempt to complete”

Based on the extremely long but very helpfull mozillaZine forum thread, Firefox may have an orphaned file(s) that prevents the program from launching after an update. On my computer, I had to delete both xpicleanup.exe and xpicleanup.dat Apparently the xpicleanup file is used to cleanup after an update or installation of Firefox. To resolve the problem the following steps may help:

  1. Restart your computer or end all running instances of Firefox or xpicleanup.exe
  2. Open Windows Explorer and ensure that you can view hidden files and folders
  3. Delete the xpicleanup.exe file from C:\Program Files\Mozilla Firefox
  4. Delete the xpicleanup.dat file from C:\Users\<username>\AppData\Local\VirtualStore\Program Files\Mozilla Firefox
  5. Firefox should now start normally
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