I have just downloaded the upgrade from Mountain Lion to Yosemite. In the process i am now unable to gain access to iTunes. The app on desktop no longer works and the install is not able to be opened.

I Have downloaded the upgrade from Mountain Lion to Yosemite. In thee process of so doing I have lost access to iTunes.
The app on desktop no longer opens the program and having downloaded and installed as per Apple instructions, can not make a connection.

Hi, drjbuchanan.  
Thank you for visiting Apple Support Communities.  
Here are some troubleshooting steps that I would recommend going through when experiencing this issue.  
iTunes: Troubleshooting issues with third-party iTunes plug-ins
http://support.apple.com/en-us/ts3430
Troubleshooting iTunes installation on Mac OS X
http://support.apple.com/en-us/ht2311
Cheers, 
Jason H.  

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