Many people who use Mozilla Firefox in Windows Vista are facing a frequent crashing problem. After 4-5 minutes their Firefox crashes and Windows Vista shows a message:
Data Execution Prevention (DEP) has shut down Firefox to protect the OS.
If you are also facing this problem, then use following simple steps and your problem will be solved:
1. Click on “Start button -> All Programs -> Accessories“. Right-click on “Command Prompt” and select “Run As Administrator“. If you are prompted to enter password, enter the password and continue. You can also open Command Prompt in Administrator mode by typing “cmd” in Startmenu Search box and press “Ctrl+Shift+Enter“.

2. Now provide following command:
bcdedit.exe /set {current} nx AlwaysOff
3. Restart your system and now you should not face crashing problem any more.
This article was posted by VG in following section: Mozilla Firefox, Troubleshooting, Windows Vista.
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VG
^^ Just change Off to On:
raunaqrox
it is saying
the boot configuration data store could not be opened
access denied.
VG
^^ Open command prompt as Administrator.
raunaqrox
i logged as an administrator only!!
VG
^^ Did you open the Command Prompt by right-click on its shortcut and select "Run as Administrator"? Also try to disable UAC and then run the command.
raunaqrox
wat is uac
raunaqrox
thanx alot it now says successful
raunaqrox
i didnt run it in administrator mode
VG
^^ Glad to know it worked for you. :)
Car54
Thanks Vishal,your solution, it worked great. I'm not sure if I'll go back to Firefox version 2, and restart DEP (thanks for the restarting thread) or not. As always, thank you.