Firefox 4 will not start on Windows 7 64bit

I just upgraded my installation of FF3 to FF4 and the installation seemed to go off without a hitch.
I left the "Launch Firefox now" button ticked and hit finish. Then nothing...
I can see that the process is being started (from Task Manager), but it doesn't do anything. There is no safe mode option available for me to try and restart it, so my only option is to kill it.
I have tried installing normally, advanced, "Run as administror", restaring my PC; none of these worked. Every time the process starts, but nothing happends. Not even a task bar windows comes up.
In the end I had to download (in Internet Explorer, yuk!) an older version of Firefox (3) and reinstall using this. This at least made it work again, but I still can't get FF4 working!
I updated it on my other personal PC and it worked fine (all addons the same, but older hardware).
In case it's relevant, I have heard of some annoyances with hardware acceleration and if I could get to the option to turn it off I would.
My particular hardware is:
Processor: Intel(R) Core(TM) i7 CPU X980 @ 3.33GHz
Memory: 12288MB RAM DDR3-1600MHz
Hard Drive: RevoDrive X2 240GB
Video Card: NVIDIA GeForce GTX 580 SLI
Monitor: LG M237WDP 1920*1080
Sound Card: M237WDP-1 (NVIDIA High Definition Audio)
Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7600) (7600.win7_gdr.101026-1503)
Motherboard: Asus Rampage III Extreme
All drivers are up-to-date, bar my OS which is fully up-to-date bar having SP1 installed. No other application are having problems.
Any help would be greatly appreciated.
Thanks.

Solved it!
It was a dodgy version of Firebug (1.6.2) running, which would kill the disable/update process. It was killing something on the first run that would corrupt my Firefox.
How I fixed it:
* Download the latest Firefox
* Install Firefox 4 (as Standard) in-place upgrade
* Before finishing, un-tick the "Run Firefox Now" button
* Hit Finish
* Find Firefox in the Start Menu and hold Shift and click the executable (safe mode)
* Leave everything disabled
* You should now have a working Firefox!
Remove/update your add-ons as needed. I only had to upgrade Firebug in safe mode to get it working.
Odd how the check for updates completely broke this Firefox, wonder what was so bad about Firebug.
Hope this helps at least one other person! The "Run in Safe Mode" option is so hard to discover now when your browser is broken!

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