sfbp,
Best advice ever.
Found in this link how to disable signing in Win7. (Win 8 = Win7 with new GUI)
http://www.killertec...gning-windows-7
Performed steps, upgraded driver and NET MD working fine again wit Sonic Stage Ultimatev2.
(after the signing disable windows warns you about Not Signed but as in Win 7 you now can ignore this warning and install the driver)
Thanks for this great advice.
Harald