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:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• TDSSKiller - AntiRootkit Utility
• Hitman Pro
• ESET Online Scanner

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!

Go to the Mozilla Add-ons Web Page {web link} (There’s a lot of good stuff here) and get a good add blocker.

Note that your System Details List shows multiple Flash plugins.

1. Shockwave Flash 14.0 d0
2. Shockwave Flash 12.0 d0

You can find the installation path of all plugins on the about:plugins page.

• http://kb.mozillazine.org/Issues_related_to_plugins#Identifying_installed_plugins

You can check the Flash player installation folder for multiple Flash player plugins and remove older version(s) of the plugin (NPSWF32) and possibly (re)install the latest Flash player.

• (32 bit Windows) C:\Windows\System32\Macromed\Flash\
• (64 bit Windows) C:\Windows\SysWOW64\Macromed\Flash\

• http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html

i have windows defender updated till today i run a complete scan yesterday and there is no malware or virus found

Run several or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

And take care of your Shockwave.