Getting my photoshop back!

So I had Photoshop on my computer for awhile. it was working fine of course. But recently I had a virus on my computer and had to completely reset it. Now when I open photoshop it says...'Could not fully start the application because of invalid personalization information' and then closes the program before I get the chance to do anything... so how do I re-enter that information and/or get photoshop back!!?

It was probley a trial that ended.