If you're having ArcGIS licensing issues, this guide should walk you through licensing your copy.
1) Open ArcGIS Administrator with Administrative rights. This can be done by right clicking on the program and clicking "run as administrator".
2) Once the window opens, on the left side of the screen will be a folder navigation panel. Press "desktop". The main screen will change. Press the radio button for "Advanced Concurrent Use" and then change the license manager to "giscenter.isu.edu".
3) Once you have finished step two, press apply and then "OK".
The picture below should assist in any further questions. Feel free to contact us further if any further assistance is required.