All DMG files "device not configured"??

Alright, this just did start happening. All the dmg files that i try to open, i get the same error. A warning box comes up, and it says, "The following disk images failed to mount" Then it lists the name of the device, example..."vlc-0.8.5.dmg"...and then shows a reason, which is, for all of them, "device not configured". I also get errors when trying to update to the newest os x as well. Anyone know what to do?

HELP!!!!!!!!! PLEASE!!!!!!!!!!!!!
I've mis-read your post, had similar issues to the person who wrote the original querie, copied these items;
/System/Library/Extension.kextcache
and
/System/Library/Caches/com.apple.kernalcaches/
to my desktop, removed them from their folders and restarted. Well, tried to restart.
The grey screen came up with the spinning gear and apple logo, then black text over laying that saying something about a stack error. I can't start my machine at all, not even from the OSx disk. It gets to Preparing Installation and keeps on spinning!
If any one can help I'd be eternally grateful. I can't believe this has happened!
Cheers
Kirstin

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