Can't read any file within a disk image

A year ago I created a disk image with a few thousand files in as an archive. Periodically I open it and access the files.
Now when I open the dmg, I see all the folders and files, but none of them are usable. No application can open them, for example opening a jpg in Preview yields the message " The file “Picture 1.jpg” could not be opened. It may be damaged or use a file format that Preview doesn’t recognize. " I get similar meesages from Word, Acrobat, etc. for their files. Basically it appears that every file in the dmg is corrupt.
I have run Disk Utility Repair which said no repair needed; I have run DiskWarrior which found and fixed problems; neither made a difference.
Any suggestions? Running 10.6.8.
Thanks

Sorry that I'm late to this party, but in case somebody else comes by this thread, this is the way to measure the voltage from the 20V plugs:
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Ray Kawakami
X22;X24;X31;X41;X41T;X60;X60s;X61s;X300;X301;Z60m;Z61t;Z61p;560Z;600E;600X;T21;T22;T23;T41;R50;A21p;A22p;A31 and A31p
Not a Lenovo employee; just a volunteer helping out here
All personal links to PC-Doctor software removed 8/2012 by mfg request

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Can't read any file within a disk image

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