Sorry, to correct Event Viewer, the error I get after uninstalling flash player and firefox then re-installing firefox is this... Faulting application name: firefox.exe, version: 22.0.0.4917, time stamp: 0x51c06b1b Faulting module name: ntdll.dll, version: 6.1.7601.17725, time stamp: 0x4ec49b8f Exception code: 0xc0000005 Fault offset: 0x0002dede Faulting process id: 0x1940 Faulting application start time: 0x01ce903f92e12738 Faulting application path: C:\program files (x86)\mozilla firefox\firefox.exe Faulting module path: C:\windows\SysWOW64\ntdll.dll Report Id: d1a5c183-fc32-11e2-80bb-94de80504a75

Find your profile and delete pluginreg.dat.

• http://kb.mozillazine.org/Profile_folder_-_Firefox

And run sfc/scannow and search for missing essential system files.

• http://support.microsoft.com/kb/929833

Hi thanks for the reply.

I've deleted pluginreg.dat and run scannow.

scannow found nothing and firefox still doesn't start.

The error message in Event Viewer is exactly the same as before:-

Faulting application name: firefox.exe, version: 22.0.0.4917, time stamp: 0x51c06b1b

Faulting module name: ntdll.dll, version: 6.1.7601.17725, time stamp: 0x4ec49b8f

Exception code: 0xc0000005

Fault offset: 0x0002dede

Faulting process id: 0x2320

Faulting application start time: 0x01ce90fb0ad66c52

Faulting application path: C:\Program Files (x86)\Mozilla Firefox\firefox.exe

Faulting module path: C:\windows\SysWOW64\ntdll.dll

Report Id: 49baf287-fcee-11e2-980c-94de80504a75

You can check for malware (i doubt that, unless you got the wrong flash, should check anyways), and look at other solutions.

• Firefox won't start - find solutions
• Troubleshoot Firefox issues caused by malware