An error occured while trying to open LSAdmin.exe

Hi,

I was trying to do the upgrade from ArcGIS 10 to 10.1. I have concurrent licenses. I uninstall License Manager 10 and install LM 10.1, when double click it to open it and do the upgrade I received a message "An error occured while trying to open LSAdmin.exe, so I Install again LM 10 and it worked.

Any clue what could be happening?

The best regards,

Diego Llamas