Deleted ServiceDesk Plus program files

Hi,

By mistake I have deleted some of the ServiceDesk program files, ServiceDesk still seems to be working except I cannot write any notes on calls, when I click on Add Notes I see this at the bottom of the webpage 'Javascript: Void(0)' whereas the others actual link to something. I am just worried if I restart the server it won't start back up again because of the missing system files.

I do have backups of our data and I just wanted to know if there is a way I can repair the installation instead of doing a complete install and also keeping my current settings and data?

I am currently running Build Number 7503.

Thanks.