Safari 6 does not load pages
I installed Mountain Lion on my 2011 MacBook Pro. Now, I find Safari does not load web pages. It attempts to load a page, but gives up so to speak after a few seconds. Chrome and Firefox work just fine. On my MacBook Air -- also with Mountain Lion installed -- I have no problem with Safari. Works normally. The problem appears to be a setting on my MacBook Pro, but I have compared settings with those of the MacBook Air and can find no differences.
I am wondering if I should reinstall Safari 6. Does anyone know where I can get a copy independent of Mountain Lion?
Thanks in advance for any help.
MacBook Pro, OS X Mountain Lion