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It sounds like we need to run a quick repair, and then reset safari
So lets start with this repair.
Open your finder ( magnifying glass ) type in disk utility, and launch the disk utility application.
On the left side of the disk utility window, click your mac hd, then at the lower right hand side, click repair permissions .
And while that is running, lets reset safari.
There is a nice visual guide on this page. Please follow steps 1-3
Once thats done, safari should be appearing, and working normally again. If you have further questions, let me know.
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