I have found a solution and now my old licenses are active.
I don't know why but someone has changed the ownership of my licens file and of some folders and link. Using some tools like WinOwnership i have recovered the ownership of this files and now all works perfectly.
The files blocked are in the following folder: C:\ProgramData\National Instruments\License Manager\Licenses while
the links are in C:\ProgramData\Microsoft\Windows\Start Menu\Programs\National Instruments\app..