After upgrading to Firefox 7 my browser is nearly non functional. CPU goes to 60% and sticks there

I regularly have about 8 tabs open. When I open the browser it can not load all of the tabs. Some load and some do not. Indeed my memory usage is low, but my cpu runs up to 60% and just lives there. I would appreciate a fix or a link to the old firefox 6 that actually worked. Thanks
In an effort to fix this I have:Installed the new version over the top of the old version:Removed the old version and totally reinstalled (left user profile)

This can happen when Firefox is not open and has to launch when you click the link in the email. It is a longstanding glitch that seems to haunt some people repeatedly while others never see it.
The usual cause is that the registry setting for URLs has become corrupted with a mixture of Firefox and IE settings. If changing your default browser to IE and then changing it back to Firefox does not correct the mix-up, you might need to fix those settings manually.
In the following article, look at the section called "File Types edit": [http://kb.mozillazine.org/Windows_error_opening_Internet_shortcut_or_local_HTML_file_-_Firefox Windows error opening Internet shortcut or local HTML file - Firefox - MozillaZine Knowledge Base].
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