Discimagemounter and Disc Utility does not work, can't open .dmg HELP PLEASE

Hello.
I've got a problem with my Mac when I try to open .dmg files I've downloaded. When I open the file it opens then instantly closes down, and when I choose "open with" and try to open with Disc Utility, it says that it quit unexpectedly and asks me to send a report or close it down. I also tried downloading stuff like "iGetter" to open files with, but since I can't open downloaded files I'm stuck in this mess.
I can't repair permissions either, since neither Disc Utility or DiscImagemounter works.
What do I do?

Backup your files off the machine to a storage drive (not TimeMachine only) disconnect
Most commonly used backup methods
then run through these Steps
..Step by Step to fix your Mac
If it's too much for you, call a local professional to assist you.

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