Note: This article applies to Windows only.
If you get a message saying -+The program must close to allow a previous installation attempt to complete. Please restart+- when you start Firefox, it is because the xpicleanup.dat program file was not deleted.
Windows 7 and Vista
- Select the in the Windows Taskbar.
- In the Search box, enter the following:
%APPDATA% - Press Enter.
- From the Application Data folder, navigate to Local\VirtualStore\Program Files\Mozilla Firefox.
- Delete the file xpicleanup.dat.
- Restart Firefox.
Windows XP
- Click on the button and select to open the Search Results window.
- On the left side of the Search Results window, click on the All files and folders link.
- Click to expand the More advanced options list.
- Put a check mark next to Search system folders, Search hidden files and folders, and Search subfolders.
- In the All or part of the file name field, type xpicleanup.dat.
- Click to begin the search.
- If any results are returned, delete them.
- Restart Firefox.