Finder does not recognize inserted disc [Solution]

After working with AppleCare and suddenly stumbling on a solution to this problem, I wanted to provide a solution for the problem on the discussion boards in case someone has the same problem.
Problem Description
When inserting a blank disc (various forms of media including DVD's and CD's) and selecting the Finder to open mount the disc on the desktop, the Finder fails to mount or load the disc with an error (no error number) indicating that the disc is not recognized.
Problem Analysis
After various attempts at fixing the problem, I discovered that the Retrospect Express Backup software I use to perform backups to my external Hard Disk was interferring with the Finder's ability to mount media. Retrospect installs a plug-in for the Finder which analyzes inserted discs in order to mount specially formatted Retrospect discs which contain backed up files. While unproven, I believe the plug-in is interferring with the Finder's behavior.
Workarounds
While the workarounds to this problem do not always work, I have usually found that one out of the options will work when the others do not. It also happens that the Finder usually performs as expected regardless after one of the workarounds has been successful for each reboot of the computer. That is, usually I have to perform one of the workarounds every time I restart my computer.
The first solution is simply to remove all external disks that might be handled by Retrospect (such as an external drive used for backups), and then to mount the new blank disc in the Finder.
The second solution is to start the retrospect software while inserting the blank media. The retrospect software should then analyze the media and take control of it. When you quit the Retrospect software, the software should then relinquish control of the media and the Finder will have the opportunity to access the disc free from interference.
Additional Notes and Requests
Ideally I would like to find out what's going wrong here specifically and find a good way for Retrospect and the Finder to work together. If anyone knows of newer updates or other such things that might help with this, then that would be great. Another thing to note is that this problem only started after the 10.4.9 update to Mac OS.
If anyone has any other workarounds or comments on this solution, do please reply with them, as these workarounds are far from ideal.
MacBook Pro 17" Mac OS X (10.4.9) Retrospect Express Installed with Latest Drivers

Hi papagenu, and a warm welcome to the forums!
What brand & Model is it?
First, Safe Boot , (holding Shift key down at bootup), use Disk Utility from there to Repair Permissions, test if things work OK in Safe Mode.
Then move these files to the Desktop...
/Users/YourUserName/Library/Preferences/com.apple.finder.plist
/Users/YourUserName/Library/Preferences/com.apple.desktop.plist
/Users/YourUserName/Library/Preferences/com.apple.recentitems.plist
Reboot & test.

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