System freezes upon opening any .dmg files

recently, i wanted to upgrade the msn messenger from version 4 to the latest, so i went to ms website to download the .dmg installer.
upon clicking, it did it's usual expanding, after which, i believe it freezes at the mounting stage. tried other software installers with .dmg, and it has the same problem. mouse pointer can still move around, but everything else freezes. force quit doesn't work.
help.
Thanks

I see, well the first thing you can try is to Repair permissions.
Run Repair Permissions in the application Disk Utility, which is found in Applications/Utilities.
If still no good then I suggest run Repair Disk.
Note the startup drive can only be repaired from another drive. Simply loading the install disk is not sufficient. You have to boot from the install disk.
To do this: Insert the Install Disk 1 into the drive and then select Restart, then hold down the C key until you hear the chime.
This will take you to the installation software, but you do not want to install.
Select your language, then go up to the top menu bar to First Aid and navigate to the Disk Utilities application.
Select the start up drive, then you click on Repair Disk .
If it finds errors, repeat the process until it reports no errors.
Then run Repair Permissions.
After these repairs, quit the application, and restart normally.
I hope that works for you.
regards roam

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System freezes upon opening any .dmg files

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