Can't access Finder & menu bar flashes on & off at "boot-up"

After installing a screensaver yesterday from an Apple recommended site, the problem above occurred but also applications are quitting unexpectedly when I access menu items & try to delete items. Also Spotlight won't work - if I type stuff in Spotlight, the app I have open just quit. I can't access finder so can't even get to delete the ??offending screensaver.
Help!!
Cramster

Have you tried uninstalling the screen saver?
After that try repairing permissions.
Applications>Utilities>Disk Utility
Then select your drive from the left and click "Repair Disk Permissions"
If that does not help, call Apple Care 1800767APPLE.
Or take your MacBookPro to an Apple Store.
Good luck!

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