Occasionally (but not always), opening Firefox freezes/crashes my entire system. Why is this? Win7 64bit

Every few uses of Firefox, I click the icon to open the program, and my system freezes. Ctrl+Alt+Delete does nothing, Ctrl+Shift+Esc does nothing. The mouse won't move, keyboard non-functioning. I have to do a hard reset of my system (hold power button until it shuts off, restart). No crash report is generated/shown/submitted, probably because my computer freezes before Firefox can even open.
This does not happen with any other program, only Firefox. Running Windows 7 64-bit.
I have to fill out this form on Internet Explorer, because now after restarting my computer firefox won't open at all, regardless of which icon i click.

I have had a similar problem with my system. I just recently (within a week of this post) built a brand new desktop. I installed Windows 7 64-bit Home and had a clean install, no problems. Using IE downloaded an anti-virus program, and then, because it was the latest version, downloaded and installed Firefox 4.0. As I began to search the internet for other programs to install after about maybe 10-15 minutes my computer crashes. Blank screen (yet monitor was still receiving a signal from computer) and completely frozen (couldn't even change the caps and num lock on keyboard). I thought I perhaps forgot to reboot after an update so I did a manual reboot and it started up fine.
When ever I got on the internet (still using firefox) it would crash after anywhere between 5-15 minutes. Since I've had good experience with FF in the past I thought it must be either the drivers or a hardware problem. So in-between crashes I updated all the drivers. Still had the same problem. Took the computer to a friend who knows more about computers than I do, made sure all the drivers were updated, same problem. We thought that it might be a hardware problem (bad video card, chipset, overheating issues, etc.), but after my friend played around with my computer for a day he found that when he didn't start FF at all it worked fine, even after watching a movie, or going through a playlist on Youtube.
At the time of this posting I'm going to try to uninstall FF 4.0 and download and install FF 3.6.16 which is currently on my laptop and works like a dream. Hopefully that will do the trick, because I love using FF and would hate to have to switch to another browser. Hopefully Mozilla will work out the kinks with FF 4 so I can continue to use it.
I apologize for the lengthy post. Any feedback would be appreciated, but is not necessary. I will try and post back after I try FF 3.16.6.

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When you start Messages fro the first time you are asked for an Apple ID
When this is verified and entered it appears in Messages Menu > Preference > Accounts and is Enabled.
The App should have also picked on on those iChat Accounst you had before.
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11:31 PM Saturday; August 11, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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There is an existing thread which might help you with this : see
https://support.mozilla.com/en-US/questions/780053
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Sometimes (but not always), when I try to open a pdf document from the US bankruptcy court website, I get a window asking if I want to use Adobe Acrobat. After I click "yes", I get a bland screen.

== Issue
==
Firefox is having problems with certain web sites
== Description
==
Sometimes (but not always), when I try to open a pdf document from the US bankruptcy court website, I get a window asking if I want to use Adobe Acrobat. After I click "yes", I get a bland screen.
== URL of affected sites
==
http://
== Troubleshooting information
==
Firefox Version
3.6.3
Extensions
Name
Version
Enabled
ID
Skype extension for Firefox 2.2.0.70 false
Java Console 6.0.01 false
Java Console 6.0.02 true
== Firefox version
==
3.6.3
== Operating system
==
Windows 7
== User Agent
==
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3
== Plugins installed
==
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*Download and Print Plug-in DLL
*Default Plug-in
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aflipflopper wrote:
Yes, it has been running slow. If I do that will it erase what is stored on the hard drive?
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