Firefox slow to start and websites won't load?

Setup: Windows Vista. Firefox 4.0.1. McAfee Total Protection 2011. Wireless home network.
As of yesterday everything worked well. Tonight I am having problems 1) connecting to the internet - I have to reconnect to my router before it accesses the internet 2) Firefox either doesn't start or is very slow 3) when it does finally slow, all the websites eventually time out and won't load.
Last night I extended my McAfee - didn't have to d/l or install anything and earlier today my computer did some kind of update. The only way I can get any websites to open is to shut off the firewall in McAfee, then things seem to work fine but I don't want to leave it off for obvious reasons. Oh and I did set up a new Windows user profile for my kids but I don't see how that would really affect anything.
Is there some kind of setting I need to change? Any suggestions would be appreciated!

See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
See "Firefox hangs when you quit it":
*https://support.mozilla.org/kb/Firefox+hangs

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