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.

Search Support

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.

Learn More

Firefox would't install updates since 3.6.4 - another copy running

more options

Firefox wouldn't intstall updates "another copy running on computer". This makes opening Firefox after update almost impossible, because the error notice immediately pops up. Brand new installation works, but does no eliminate the problem. XP Professional SP 3.

This happened

Every time Firefox opened

== I updated to 3.6.4 ??

Firefox wouldn't intstall updates "another copy running on computer". This makes opening Firefox after update almost impossible, because the error notice immediately pops up. Brand new installation works, but does no eliminate the problem. XP Professional SP 3. == This happened == Every time Firefox opened == I updated to 3.6.4 ??

All Replies (1)