Disk images failed to mount - codec overrun

Hi,
So after searching through the related posts I have been unable to correct my probelm, which is:
I am unable to open some .dmg files. I have tried to open three different .dmg files from a variety of sources and they all return the same error:
disk images failed to mount - codec overrun
However, I was able to update my system to 10.4.7 using the updater. This did not solve the problem. I then tried load the combo version of 10.4.7 as suggested in a different post and while it didn't load (I accidentally grabbed the powerPC version) it was able to open the .dmg and look in them.
Disk Utility is unable to attach the three that won't open. The first two Disk Utility was unable to verify or repair. The last (a cars game demo) was successfully verified but still came up with the codec overrun error when I tried to attach it. Finally I have tried removing the following two files and then restarting, to no effect.
/System/Library/Extension.kextcache
/System/Library/Caches/com.apple.kernalcaches/
I'd appreciate any help offered. A search on codec overrun was of no use. I searched for "mount failed disk images" and variations of that to find what I have already tried.
Thanks
Pete

I am havin the same problems. codec overrun
I am trying to download stuffit from their site so I can open a program for school.
I tried to download the dmg file from the apple site but was given the same error. Codec overrun
Also I attempted to get the updates from the Apple site.......same error.
So far this computer will not download much of anything without some kind of an error. Essentially this Imac is a $2000 jukebox. It does play music wonderfully.
My roommate was able to downlad easily from the same internet connection with no problem the windows version of the program from te same site.
This is a brand new out of the box iMac. 20" 1 gig 250 GB machine. First Mac for me and it is turning into a real headache.
Any help with the codec overrun would be appreciated.

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copy here
But I don't like to do this a) because what if it really isn't working fine and b) the kids won't know what to do.
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[email protected]

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Disk images failed to mount - codec overrun

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