Since upgrading my mid/late 2007 MacBookPro to Mountain Lion 10.8.1 everything slowed down

Yesterday I upgraded to Mountain Lion OS 10.8.1 everything slowed down. Adobe Illustrator takes forever to perform any operation, Same goes for Chrome. I have quit all the aplication except for Illustrator and it's still extremely slow.
I have upgraded ONLY because I read that upgrading to 10.8 will fix a problem with saving to PDF from Illustrator. It did not solve that problem.
Intead now I cannot use Ms Word, Excell, Powerooint  I was able to use with 10.6. !!!
I want to revert back to OS 10.6.!!!
How can I do that???
Please help!
AgathaM

Welcome to Apple Support Communities
Open > http://www.reedcorner.net/understanding-upgrade-nightmares/

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