Windows NT (3.1 to 4.0) no longer receives security updates
Support for this version has ended (NT 4.0 Workstation: June 30, 2004). These guides can still help you set up or repair a computer, but where you can, keep it off the internet for banking and email, and plan a move to a version that is still supported.
Guides for Windows NT (3.1 to 4.0)
2 guides. Start with the one that matches what you want to do.
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How-to
Windows NT 4.0 Workstation: how to install it step by step
Plan the partition and file system, start Windows NT 4.0 Workstation Setup from the CD, and finish the install, using Microsoft's own archived manual.
Windows 2000 and older
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Fix
Windows NT: installing programs and fixing common problems
Add or remove programs and drivers on Windows NT 4.0, and recover from startup trouble using the Emergency Repair Disk and the Setup disks.
Windows 2000 and older