After installing the maverick i get this message when i try to open   iTunes: If you want to run i 64bits modus you must remove the mark:Open in 32bits modus.But i have removed the 32bits and i still can't get it to work!Have maces

after installing maverick i get this message when i try to open itunes:Unmark the 32bits modus-but i have unmarked it several times!The new iTunes requires 64bits modus so what shall i do?

I upgraded my 2007 iMac (20") to Maverick. Should never have done this! Lost mail, lost my mail archive, lost numerous programs/applications, lost all my installed hardware, spend 4 days on getting it running again with the (supreme) help of Apple Care. However it should not have happened at all!
iMac Computers with less than 4Gb of internal memory (as explained by Apple Care), or less than (estimated) 150Gb of free disc-space should not upgrade! Simple as that and the App Store should warn you about that and not simply let you pick up your free copy of Maverick!

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