Preview and jpegs

Since I updated my wife's Macbook to Snow Leopard, Preview will not open jpegs. She gets a blank window. I have Snow Leopard on my Macbook Pro and I can open the same jpegs with no problems.
I ran the Disk Repair utility on her machine and got error messages saying System/Library/Core and System/Library/Private had been changed and will not be repaired.
Any suggestions?

I have the same problem all the sudden, just a blank window when opening any file in Preview (jpg, pdf, doc....). I have tried to login to my gf's account and the problem persists. So I think it's a system folder problem. Had just done the Repair Permission but still couldn't see any image in the Preview. Also tried to boot in safe mode but Preview was still not working...
Have also been searching for a while but couldn't find answer yet. Please could someone give me a hand to solve this problem.
Cheers
Stephen
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