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I got this error:

Timexxxx In 'CFPasteboardCopyData', file /SourceCache/CF/CF-550.13/AppServices.subproj/CFPasteboard.c, line 1951, during lock, spin lock 0x15457a0c8 has value 0xf0000000, which is neither locked nor unlocked. The memory has been smashed.

My Mac freezes except the mouse and keyboard. What is happening and how can I prevent this from happening in the future?

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The first thing I would do is to go to Applications->Utilities->Disk Utility, highlight your harddrive and "Repair Permissions". If you can't do that on a normal boot, you might try if from "Safe Mode" (hold the "Shift Key" down while booting) or boot from your OS X DVD (hold the "c" key down while booting to boot from the CD/DVD drive). Then, after a few steps you should be able to access the Disk Utility.

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