Super slow computer and doesn't shut down

Hi all,
I think it is only fair to come and share with you an issue I had with my 2011 Mac Pro runing on Lion 10.7.3. The computer is just a few months old. For a month or so I started experiencing a SUPER slow computer. To illustrate, it would slow down suddently and would take 10 minutes to give me the About this Mac info. After hard shutdown it would get normal again for a few hours. This happen usually while using Google Docs, and after trouble shooting and not getting anywhere... reseting power management (SMC), etc... Just to test I de-activated the Kaspersky Anti-Virus software for Mac, thinking that it may have been the cause while working on Google Docs... and it work!
One problem solve... but I run into another one. The computer would freeze after shuting down, and the screen would be gray with the little turning wheel... Every day from there I had to do the hard shutdown... not healthy for the computer of course... After re-installing the operating system, going back and forth with Apple Care Specialist (very helpful and nice people), and spending hours figuring the problem out... I decided to un-install completely the Kaspersky Anti-Virus for Mac, but downloading the 'free' version and using the un-installer from the package... After this my computer shuts down everytime and goes to sleep normally. This saved me from formatting the HD and doing a clean installation of Lion - which was my next step if things didn't work according to Mac support.
I still have the Kaspersky for the parallels side of the computer and that doesn't seem to be an issue. I hope this saves some people the trouble, the frustration and the MANY hours of trying to figure it what's wrong with the computer.
I have read many blogs, and articles and none of them pointed at Kaspersky... I found issues with Parallels, Office for Mac, etc but I guess after the last Lion update thing went south with the anti virus software... and of course my computer! Now we're all happy again!

Something is causing it to not shut down, more than likely some process that refuses to quit. Do all of your applications quit when you shut down or do you have to force quit any of them? You also should look in your console messages and see if perhaps there is a clue there.
When you ran Disk Utility did you get the message that the "drive appears to be o.k." or did you get some other message?
Do you have problems with freezing in general or just when you are installing applications? When you say freezes do you mean you get the spinning beachball or does it freeze and you can't do anything including moving the cursor?
Do you use a lot of widgets in Dashboard? Sometimes they will cause problems. If you have loaded any of them recently you might try removing them and see if that helps with the shutdown issue.

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