NEC Express5800/B120b User Manual page 322

B-20 Installing the Operating System
18.
Select the partition created, and then click [Next].
When the following message appears, the installation starts automatically.
NOTE:
you will be prompted to replace a media with that for OS installation.
Insert the install media according to the on-screen message.
Install Windows – Insert Disc
Please insert Windows installation disc 1.
If the disk drive contains NEC EXPRESSBUILDER DVD,
OK Cancel