Firefox will not start up. On PC restart message NsShell:EventW appears What is this?

The PC starts up normally. When I try to start Firefox, it will not load.
If I then restart PC as it is closing down an error message appears.
This is unresponsive
nsAppShell:EventW...
and I have to click "end now" to continue shut down/restart.
My antiviral program is updating/downloading normally
I can get online with Internet Explorer

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://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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    Did this fix your problems? Please report back to us!

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