Kernel Panics when shutting down??

[ideal.dreams]

I have a 2009 17" MacBook Pro. The last two nights I shut it off it had a kernel panic and rebooted. It's done this a few times in the past when I shut it down as well but I disregarded the occurrences. They have ONLY happened during a shut down.

I can't figure out what the problem is; is my computer just getting to the point where it's old & going bad? Is it software related?

If anyone can shed some light on what might be causing this to happen I'd appreciate it!

 

[eagandale4114]

Disk utility and repair permissions. If that failed re download the combo os update from apple.

 

[ideal.dreams]

I repaired permissions two nights ago and haven't had a kernel panic since, looks like that did the trick. Thanks!