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Firefox: The program must close to allow a previous installation attempt to complete
 10 comments. Current rating:  (3 votes). Leave comments and/ or rate it.
I was running Firefox under a limited user account, and got the "critical updates needed" icon, which I foolishly pressed. Then I find out it can't install unless I'm an admin, so I log back in as admin, finish the install, and it won't run. Instead Firefox will say "The program must close to allow a previous installation attempt to complete" and then shutdown.
Various combinations of uninstalling firefox, rebooting, cleaning firefox keys from the registry, rebooting, reinstalling firefox still result in the error message "The program must close to allow a previous installation to complete".
Answer: Remove the restrictions from that account and try then again (uninstall, fresh install) That worked for me. I had a similar situation where 2 Windows installations shared one machine.
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THANKS TO GEEKADMIN FOR THIS :
This error usually happens on interrupted upgrades or power offs, the resolution is very easy you had to go to the program files folder, and after the mozilla folder.
And just delete the XPCLEANUP.DAT file. That´s it.. No more troubles, finito…
And you can enjoy the best browser…
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Thanx
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The solution for Vista can be found at kb.mozillazine.org. xpicleanup.dat is located in the “C:\Users\\AppData\Local\VirtualStore\Program Files\Mozilla Firefox” folder in Vista. Deleting it there seems to work.
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I also have vista, and I tried both advice, and still can't run it... should I delete something from C:\Windows\AppPatch, I have nothing under c:\program_files\mozilla firefox or c:\users\myuser\appdata...
thanks
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deleting XPCLEANUP.DAT file worked for me, thanks!
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worked like a charm!!!
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I have vista. When I try to delete the xpiclean.dat file it says I need to have permission to delete the file. But i am the adminstrator... heelp.
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thanks, worked for me too, delete: XPICLEANUP.DAT
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If you can't delete the file in Vista you will need to end the xpiclean.dat process in the task mgr. This problem still happens with my machine every couple of weeks though.. Any long term solutions?
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After many attempts I think I finaly worked it out. On vista first check if there are any xpcleanup process running, if so kill them all. Then Deleat that file in mozila folder (xpcleanup). Than right click on firefox icon and run as Admin, firefox will continue to update and work. If that didnt work uninstall and fresh install.
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