Unable to re-install Desktop for Mac

I had previously been running build 3214 and had no problems. I then developed a problem installing some Windows XP software. My Computer showed a CD with Parallel Tools even though there was a totally diff. CD in the drive. I thought something might be corrupted.

I uninstalled Parallels and put all files and folders in the trash. I then put my original Parallels install CD in the drive. I went thru the preliminary install procedure, selected the Mac hard drive and clicked install. I received a message that said "you cannot continue, there is nothing to install". I'm stumped.

 

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