iTunes doesn't open and give a blank message
Exploratory troubleshooting: try holding the Option (or Alt) key down while you launch iTunes. Hold it until you see the following:



Now press "Create Library…" and see if you have any more success.

As a second option, try creating a new user on your system and see if iTunes works any different/better there.

These are steps to help you determine if the problem is the iTunes application or if it's something specific to your user account and its data.