Mozilla freezes computer

[Mike C]

ANY Mozilla, (Seamonkey browser or mail and/or Firefox) freezes entire 
computer.  It forces me to do a "hard shutdown".

Ive done the following:
Uninstalled and reinstalled both Firefox and Seamonkey.
Disc cleanup, Malwarebytes, Superantispyware, Ccleaner, Rouge Killer,

Any ideas other than reinstalling Windows 7 pro??
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