Itunes freezes macbook pro 2011

I have a new macbook pro.  Whenever I start iTunes the whole computer becomes extremely sluggish.  If it don't close iTunes in time, it freezes and requires a manual reset.  I've completely reinstalled OX Lion, and it didn't help.  I completely reformatted my macbook with a fresh install, no help.  I installed the app, "app zapper." and it didn't help.  Each time iTunes works great for an hour after the reinstallation then goes back to it's normal behavior.  No other app or process is causing this behavior.  It makes no difference if my iphone is connected either.  Only iTunes is causing this behavior...
Help?

Hello,
eventually iTunes collides with another application, a installed add on or a corrupted iTunes database.
First Aid
Open Console
On left, unfold "files" -->> ~library/logs/"
Click on "Crash Reporter"
Last crashes will show up on left. Click on the first in list depending to iTunes
Copy the text as far as the line "Crashed Thread: <number>" including that line.
Copy the section of the crashed (#x) tread itself.
Post here.
The report will show, which application or add on causes the crash.
Lupunus

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