NEC Express5800/B120a User Manual page 317

18.
Select the partition created, and then click [Next].
When the following message appears, the installation starts automatically.
NOTE:
If the disk drive contains NEC EXPRESSBUILDER DVD,
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.
Installing the Operating System B-19
OK Cancel