itunes installed but it won't open the new version- any advise

Hello goreckim,

Thanks for the question, and welcome to Apple Support Communities.

I understand you are having some issues with iTunes on your Mac Pro. You may want to isolate the issue further by testing to see if it persists in a new user account:

Isolating an issue by using another user account

http://support.apple.com/kb/TS4053

You can also try starting iTunes in safe mode:

iTunes: Troubleshooting issues with third-party iTunes plug-ins

http://support.apple.com/kb/TS3430

Thanks,

Matt M.