I just upgraded to FF 4.o, had 3.X running just fine, the upgrade went fine, but now it won't open Firefox at all.

I just upgraded to FF 4.o, had 3.X running just fine, Windows 7, the upgrade went fine, but now it won't open Firefox at all, it just loads and sits there and stops, but my task manager shows FF running in the background, I have tried reinstalling twice, no change, what is causing this?
Processes is the only place it shows Firefox running, programs won't show it in Task Manager.

Reinstall 10.6 again, but this time hold c boot off the 10.6 and erase the ENTIRE internal drive.
You do this by selecting the drive makers name and size on the left hand side, not the slightly indented partition underneath it.
If you erase and install 10.6 only into a parittion, say Macintosh HD, the you still have the hidden Lion Recovery Partition on the drive and it appears you already have 10.7
In the MAS, hold option and click Purchases to redownload Lion
FYI, you don't need to install 10.6 to reinstall 10.7, 10.7 can be reinstalled via the Lion Recovery, Command r boot.
See this for more info
https://discussions.apple.com/docs/DOC-3046

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