Hi Silvano,
I found a similar case from another customer. Nationl Instruments is aware of this issue. But the only workaround for now would be (propre version):
1) uninstall LabVIEW DSC and LabVIEW
2) delete the registry key from the old LabVIEW eval version with regedit.exe.
[HKEY_LOCAL_MACHINE\Software\National Instruments\LabVIEW\lvedid]
3) reinstall LabVIEW and LabVIEW DSC
(short version)
1) Rename lvedid in the:
[HKEY_LOCAL_MACHINE\Software\National Instruments\LabVIEW\lvedid] to e.g. ..\LabVIEW\1lvedid
Hope this helps
Roland