Windows 7: FireFox Hangs

Hi,
I am using a Lenovo laptop with i5 processor, upgraded its OS from Windows 7 Home Basic to Home Premium. I also have Norton360 and TuneUp Utilities (latest versions, 2012).
Firefox 11 was running OK, but because I had many add-ons, I decided to uninstall it and get myself a fresh browser. So, I did that with Revo Uninstaller Pro.
After the re-installation, every time I run Firefox the address bar doesn't take any input from the keyboard. The program itself accepts the mouse clicks on menus for a short time, before it freezes completely!
After I press Ctrl+W, it adds +1 to the number of opened tabs. Firefox opens 2 tabs on start up, one for the homepage and the other on Mozilla site. But it asks me "do you want to all the 3 opened tabs?". It does the same when there is only one tab opened.

Is windows 64bit?

Hi, nckfrtg28

Yes it is 64bit.

Then why don't you give Waterfox a try. It's firefox for 64bit operating systems.

http://waterfoxproject.org/

The same exact problem itself!!!

* I have tried to make another profile but it didn't work. I also started Firefox in safe mode but it froze after few seconds. Installed it on drive D, didn't help either.

It seams like there is a problem in the registry.

That's why I used TuneUp Utilities but it didn't fix it. Do you have any suggestions?

Are you a 100% sure theirs not a virus on you computer?

As sure as Norton360 says. It didn't report anything.

Ok, it seems that after every new installation Firefox adds a new virtual tab to the actual ones it opens. I have just re-installed it, when I tried to close it after the first run, it said that there are 5 tabs opened, in its warning message! If you can help with this it will be great, if can't, how can I report this problem to Firefox.