I have been using ArcGIS since this March, but one time while trying to open ArcMap it showed me the error message, "The ArcGIS for Desktop Advanced license is in need of a repair operation. Please access the ArcGIS Administrator to repair your licenses." I know some people have the same issue and I have seen some posts about how to fix the problem, using repair in control panel as mentioned by Dan. But it doesn't work in my case. I am using one-year educational trial, single use, which expires next March. Another problem I have is that I am out of state for four months and don't have my authorization serial number with me! So I am wondering if there is any way that I can fix the issue without re-authorize ArcGIS. Thanks.