Windows NT and Windows 9x Dual Boot Setup


Many people have an interest in setting up their computers to be able to boot either Windows 95 (or Windows 98) or Windows NT. Here's the easiest way to do that, and what to watch out for. The information below is for adding Windows NT to a system that already has Windows 95/98. I have a separate page with information on adding dual-boot to a system that already has Windows NT installed. 

First, keep the following points in mind:
1.  NT cannot be installed on any drives that are formatted as FAT32, nor can it currently view any data on such drives.
2.  Windows 95/98 cannot view any data on drives formatted at NTFS
So, if you want to run dual-boot and have either operating system see all the drives on the system, you must keep them formatted as pure FAT (also called FAT16).

Steps for setting up dual-boot:
1.  Install Windows 95 or Windows 98. If you already have Windows 9x installed, don't bother reinstalling unless you need to reformat your drives because of the above warnings.
2.  Put in the Windows NT CD-ROM. It should auto-run and bring up a window with a button to "Install Windows NT". If not, go into the /i386 folder and run winnt.exe.
3.  NT will start to install, copying tons of files to the disk, then will require a reboot.
4.  In the second phase of the installation, NT will display your drives and partitions. It will ask which partition you want NT installed upon. Select any of the partitions that are FAT (you can even select the one that Windows 9x is on). When prompted whether you want that partition reformatted, be sure to select that you want to keep the existing file system intact! NT will install to /winnt, not to /windows, so it won't overlay Windows 9x.
5.  Installation will continue, with numerous reboots. NT will automatically set up a dual-boot menu.
Once completed, upon booting the system you'll see a menu that has three entries similar to this:

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