I installed Firefox 4 two days ago, and my system immediately began to run very slow and/or crashes. Should I re-install earlier version (that opened with google instead of yahoo)? If so, how do I get it?

Additionally I am getting a McAfee warning that "McAfee cannot update you software. Check your internet connection, and then try updating your software manually. If the problem continues please reinstall this software."

You might try using the add-on 'NoSquint' which allows numerous zoom options specific to each page you visit & keeps your settings - https://addons.mozilla.org/en-US/firefox/addon/nosquint/
If you want to go back to 3.6x, you will find it here:
http://www.mozilla.com/en-US/firefox/all-older.html
In most cases you can simply "upgrade" (meaning downgrade) directly from the installation. It would be a good idea to save your passwords & bookmarks just to be on the safe side.

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