I am having a problem opening my browser, the broswer is hanging up after slowly opening

Hello, I have been having trouble with my firefox browser for quite some time now, it just stopped working on me about 5 or 6 months ago. I have switched over to Internet Explorer which has still been working fine. I like using Firefox much more than Explorer these days, but I am unfortunately not good much with fixing computer problems and have pretty much extinguished all my available options for repairing it myself.
The problem with Firefox is now when I click on the shortcut link on my desktop, it takes a good 5 to 10 minutes to open up the browser now. Once it does finally open, you cannot type or click on anything it is hung up and will not allow you to go to another site(the home page will still load, with current news and other information)
I cannot remember anything that would have caused it to crash or get hung up like this, but like I said I am not a computer expert by any means. I do know that I am ready to get Mozilla back to running smoothly as before, I had just gotten really used to it(I had been using internet explorer).
I also uninstalled Firefox completely and reinstalled it, I figured if nothing else I tried worked that usually is the best option...it still did/does the same thing, hangs up everytime you try to run/open it.
I checked your online solution for what to do on a hanging first page, I saw something about pentium 4's running Windows Vista or XP...my computer runs Windows 7 (was actually purchased running the terribly bug ridden and error-prone Vista, and lucky I was able to obtain a free upgrade to 7). So I was thinking maybe that had something to do with it, I had some problem in the past, with what I cannot remember, but it traced back to something from when Vista was on my computer(even though it was no longer my operating system I'll be darn if it wasn't still causing me headaches! How fitting.)
My computer in question is a Dell Studio XPS 1640 which I bought new almost two years ago exactly)
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Did you check what I would consider the first place to look:
* http://kb.mozillazine.org/Problematic_extensions
If the site is still down (at least 12 hours) when you read this try [http://webcache.googleusercontent.com/search?q=cache:http%3A//kb.mozillazine.org/Problematic_extensions Google's cache]
Link or url would make it easier to see which page you tried rather than "your online solution for ...".
* http://kb.mozillazine.org/Firefox_hangs ([http://webcache.googleusercontent.com/search?q=cache:http%3A//kb.mozillazine.org/Firefox_hangs cached version])
* http://kb.mozillazine.org/Firefox_crashes ([http://webcache.googleusercontent.com/search?q=cache:http%3A//kb.mozillazine.org/Firefox_crashes cached version])
* [https://support.mozilla.com/kb/Firefox%20hangs#os=mac&browser=fx4 Firefox hangs | Troubleshooting | Firefox Help]