Where is still another possibility to run Pentagon I on Win7 64 bit without running Sonar X1 as administrator:
Open regedit.exe
Go to HKEY_LOCAL_MACHINE\SOFTWARE\rgc:audio Software\Dxi\Pentagon I
Right click on the Pentagon I folder and select permissions
Set the permission for group users to allow full access and click ok
Now I can start Sonar X1 without running as administrator and I can also use Pentagon I.