Help! Can't mount disc images or run Disc Utility!

Hey all,
Somethings gone wrong with my iMac, I've attempted to mount a disc image, and I receive the following error:
"The following disc images failed to mount. Reason: No such file or directory"
This now happens with every single .dmg file I try to mount. Even ones I know work because i've used them before. So I know for a fact that the file I've tried to mount isn't just been damaged.
It gets worse...
I tried to run Disc Utility to repair the problem and it won't open. Everytime I try I get the message "The application Disc Utility quit unexpectedly". I click re-open, and try again, but still nothing.
I don't know what to do, i've downloaded Disc Warrior, but couldn't install as I obviously can't mount dmg files.
Also, my Toast application won't open, don't know if that has anything to do with it.
Anyway, does anybody have any advice? It would be so greatly appreciated.
Thanks!

Hey guys, so I've acquired the DiskWarrior disc, rebuilt the drive, and I am still unable to mount dmg files.
Any further suggestions?

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Help! Can't mount disc images or run Disc Utility!

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