Help! Lightroom freezes after installing.

I get this message after trying to create or open a catalog: "An error occured when attemting to change modules." Then Lightroom freezes.
I work on a Mac and have formatted and reinstalled my systemdisk with a qlean install. I had Lightroom installed and have used it for some years. But when installing the programs again I went for the Creative Cloud solution. When I tried to open my previous catalog I got this error message. And after several deinstallings and reinstallings I still get the same message and Lightroom freezes.
Anyone who can help?

Hi Ian.
Thank you for answering. But I find no such file in Preferences. I think Lightroom freezes before making the preference file. Other solutions?
Best wishes,
Magne
6. okt. 2012 kl. 11:43 skrev Ian Lyons <[email protected]>:
Re: Help! Lightroom freezes after installing.
created by Ian Lyons in Photoshop Lightroom - View the full discussion
Have you tried trashing the Lr preference file? More details of location at http://forums.adobe.com/thread/358041?tstart=0
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