This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

تلاش سپورٹ

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

مزید سیکھیں

Why do I get an error 21 notice when I try to uninstall Firefox betta?

  • 1 جواب دیں
  • 9 میں یہ مسئلہ ہے
  • 2 دیکھیں
  • آخری جواب بذریعہ Xircal

more options

I was having problems with Firefox repeatedly crashing and decided to uninstall and reinstall. I'm a bit new to IT and installed MF 4.0 beta 11. I was told by my son that this is a trial version which I shouldn't really use until my knowledge is better. I tried to uninstall MF beta 11 but keep getting an error 21 notice. I installed MF 4.0 in the hope that it would uninstall the beta version but that hasn't happened. How do I get rid of the beta version?

I was having problems with Firefox repeatedly crashing and decided to uninstall and reinstall. I'm a bit new to IT and installed MF 4.0 beta 11. I was told by my son that this is a trial version which I shouldn't really use until my knowledge is better. I tried to uninstall MF beta 11 but keep getting an error 21 notice. I installed MF 4.0 in the hope that it would uninstall the beta version but that hasn't happened. How do I get rid of the beta version?

تمام جوابات (1)

more options

Please do the following.

Go to Download Firefox 4.0.1 and download a fresh installation file to the desktop.

Then go to Add/Remove Programs in Windows Control Panel, scroll down to Mozilla Firefox and remove it, choosing to keep your bookmarks, customizations etc., (don't checkmark the box).

Then reboot and delete the folder called Mozilla Firefox at this location: C:\Program Files\Mozilla Firefox

Finally run the installation file you downloaded to the desktop earlier.

Your bookmarks, customizations etc., are maintained in a different location and will become available to you again once you complete the installation.

After you complete the installation, go to the Plugins Check page and update those if necessary.