Screen Flashes on and off

With auto log in my mac screen flashes on and off it has only just started when I started in safe mode, I was told that it would clean up the Mac. But since then, the only way I can make it work ok is to log out and log in again holding down the shift key. I think it is something to do with the Finder as it keeps giving messages like Don’t Open & Reopen.

MacBook Pro/ late 2008 /Mavericks

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