For now I will assume that when you insert the installation disc that the autoplay does not go into action.
If that it what is happening, then go to File Explorer in the Task Bar, go to Computer and right click the drive in which the installation disc is inserted.
Select Run Auto-Play and then, in the dialog that appears, click on Run AutoPlay.exe.
If worse comes to worse, which it should not, you can always install from the Premiere Elements Folder's Setup.exe file.
Please let us know the outcome.
More information on this later.