Boot from disk 1, partition and format the disk using FDISK and FORMAT, reboot and follow on-screen instructions.

Disk 1 is the boot and installation disk
Disk 2 is DEC's release of MS-DOS 3.10 (designated as version 3.10.028c)
Disk 3 is the first disk of DEC's release of Windows 1.01 (designated as version 1.01.11)
Disk 4 is the second disk of Windows 1.01
Disk 5 is DEC's VAXmate Information System 1.0 online help application for Windows 1.0