OS 10.8.4 (recent upgrade) and can not open a .dmg file

I am using an iMac 2.8 GHz Intel Core i7 and have recently upgraded to 10.8.4 and can not open any .dng file. It indicats that it is not recognizeable. How can I intall my downloaded software?
Thanks

Something else is going on then.  Set up a test/new account.  If the problems appears there too, then it means it's a system wide problem.
Another thing to try if you have not already done so is to disconnect all devices from your computer, repair permissions and restart your computer.  Or do the following: 
Mountain Lion Recovery
Boot up from your computer by holding down the command+r keys.  This will take you to the recovery drive.  
Select Disk Utility & hit Return.   
In Disk Utility select the HD on the left & click on Repair Disk (bottom right).

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