Bonjour wont delete so can not down load new iturns

Download the Windows Installer CleanUp utility from the following page (use one of the links under the "DOWNLOAD LOCATIONS" thingy on the Major Geeks page):

http://majorgeeks.com/download.php?det=4459

To install the utility, doubleclick the msicuu2.exe file you downloaded.

Now run the utility ("Start > All Programs > Windows Install Clean Up"). In the list of programs that appears in CleanUp, select any Bonjour entries and click "Remove", as per the following screenshot:

Quit out of CleanUp, restart the PC and try another install. Does it go through this time?