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Spoolsv not starting due to mozsqlite3.dll missing


Whenever I install version 4 of Firefox, upon restarting I am getting the message spoolsv could not be started due to mozsqlite3.dll missing.

If I go back to version 3 everything is okay.

Additional System Details

This started when...

I installed or updated to firefox 4

Installed Plug-ins

  • Office Plugin for Netscape Navigator
  • np-mswmp
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Adobe PDF Plug-In For Firefox and Netscape 10.0.1
  • Default Plug-in
  • Google Update
  • Shockwave Flash 10.2 r153
  • Adobe Shockwave for Director Netscape plug-in, version
  • iTunes Detector Plug-in
  • DivX Web Player version
  • DivX VOD Helper Plug-in
  • Next Generation Java Plug-in 1.6.0_23 for Mozilla browsers
  • Yahoo Application State Plugin version
  • 4.0.60129.0


  • User Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv: Gecko/20110319 Firefox/3.6.16

More Information

  • Top 10 Contributor
  • Moderator
3197 solutions 24404 answers

Try creating a new profile exclusively for 4.0 and create a desktop shortcut with -P "profile" appended to the target to launch that profile.

Question owner

Tried that and still get the same result when starting my computer about mozsqlite3.dll being missing so spoolsv won't start and saying that a re-install will fix it.

Have even done a clean install after totally removing firefox and still the same problem

  • Top 10 Contributor
  • Moderator
10761 solutions 96861 answers

Do you see that file in the Firefox program folder ("C:\Program Files\Mozilla Firefox\") ?

Do a clean (re-)install:

  • Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
  • Don't remove personal data if you uninstall the current version.
  • It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.

Your bookmarks and other profile data are stored elsewhere (not in the Firefox program folder) and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.

Question owner

I have done a clean re-install even removing all the personal data and still the problem persists.

The file is in C:\Program Files (x86)\Mozilla Firefox folder but isn't in there for version 3, only version 4.

  • Top 10 Contributor
  • Moderator
3197 solutions 24404 answers

Firefox 3.x versions don't use that file, it's new for 4.0.