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Once in the graphical portion of Setup, you will eventually reach Network Setup where Windows NT will detect no network adapters.

Setup will run through and switch over to the graphical portion. Create a partition, choose whatever you want (the NTFS conversion consistently fails for me for some reason so might as well stay with FAT). Setup will load it and detect the CD-ROM drive. Windows NT will detect no SCSI drives, press S at this point and insert the ATAPI.SYS boot floppy linked above.

Start the virtual machine with the boot floppy inserted.

If you don't do this, you will screw yourself over when the graphical portion of Setup starts and have to restart from the beginning again with lots of wasted time. Replace "Windows NT 3.1" with whatever you called your virtual machine. There, type in this command (thanks to OS/2 Museum for this):Ĭode: Select all VBoxManage modifyvm "Windows NT 3.1" -cpuidset 1 00000543 00000800 00000209 078bf1bf The defaults set by VirtualBox are fine but you will need to add a floppy controller with a floppy drive (strangely enough this is not added automatically).īefore you first start the virtual machine (this is important), open a command prompt on the host and navigate to the folder where VirtualBox is installed. Once you have everything you need, create a new virtual machine and set it to Windows NT when it asks you to. (Or alternatively, just edit TXTSETUP.INF and delete the section at the very end.) Then, copy TXTSETUP.INF from the CD over the copy that is present on the boot floppy. * Delete the temporary folder that Setup has created (C:\$WIN_NT$.~LS). Don't do this and instead reboot off the hard drive again (will still be the operating system as you left it). Setup will create a boot floppy, copy various files to the hard drive and then tell you to reboot from the floppy. * On the DOS prompt, switch to the CD-ROM drive, go to the I386 folder and type WINNT to start Setup. I used an old virtual machine with a pre-installed MS-DOS but I suppose you could use a boot floppy or even Windows 95/98. * Boot into any virtual machine that has a DOS prompt and CD-ROM support. If you don't have a Windows NT 3.1 boot floppy there's a cheap trick you can use: Noting this down as a personal scratchpad because I keep forgetting the steps, but it might be useful to others too.