Problems opening downloads on my iMac

I posted this question about a week ago, but never saw a response, and can not find it now.
I am not able to open downloads of software or other things. I know I should just be able to double click on the file and it should open, but it doesn't. When I right click on open with, it says 'do  nothing'... and that's exactly what it does.. nothing. I have found the path to the DiscImageMounter, but when I click on that I get an error message saying the file type is not recognized and cannot be opened. Somehow, the preference to open downloads has gotten corrupted.
Can anyone please suggest a fix for this.
Thanks!
iMac 2.4 Ghz Intel Core 2 Duo (c. 2007)
4 Gb RAM
OS 10.6.8

The startup disk may need repairing.
Launch Disk Utility located in HD > Applications > Utillities
Select the startup disk on the left then select the First Aid tab.
Click:  Verify Disk  (not Verify Disk Permissions)
If DU reports errors, start up your Mac from your install disc to make repairs.
Using Disk Utility to verify or repair disks

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