Yamaha SIGMA-G5SII Service Information page 260

(3) User Account Control Setting
When the NT-100 system software is installed in Windows7 and used, the user
account control should be disabled. (When the unique user account control (UAC) of
Windows7 functions, it disturbs the NT-100 system software operation).
(4) NT-100 System Software Setup
The same procedure is applied when the software is newly setup and when the
already setup software is graded up.
① Insert the NT-100 system software CD-ROM into the CD-ROM drive in the
started up computer.
② Display the Install Launcher window.
Press the "Computer" in the "Start" menu.
When the " Computer " window opens, double-click " DVD RW Drive (D:) " .
When the "DVD RW Drive (D:)" window opens, double-click "Launch.exe".
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SI1705004E-00=SIGMA-G5SII Service Manual