Having upgraded to Firefox 24 it will now not start at all after clicking on the icon. My OS is Windows Vista premium. It will start in safe mode.

Upgraded to Firefox 24 and now nothing at all works despite uninstalling and reinstalling it several times and losing all my bookmarks etc. However it does start in safe mode. At first I thought it was my security Norton 360 but after 2 hours in contact with them I'm still in the same position. When I double click on the Firefox icon I can see the cursor timing out and then it just disappears and nothing loads.
My OS is Windows Vista Premium and I am using Windows internet explorer at the moment.
HELP please!!!

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
Did this fix your problems? Please report back to us!

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