Can't open DMG files on 10.5.8

Hi,
I just updated, and to my surprise I can't open any of my DMG files, not even the ones that I download from places like macupdate.com, can somebody help me? Thanks.

HI,
Try repairing disk permissions.
Quit any open applications/programs. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and restart your Mac.
This process can take up to 10 minutes.
Carolyn

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