You can automatically upgrade to Windows NT Workstation version 4.0 from
MS-DOS version 6.x, Windows or Windows for Workgroups version 3.x, or
Windows NT Workstation version 3.x. If you install Windows NT Workstation
4.0 in the same folder as your existing installation of Windows or Windows
for Workgroups 3.x, your existing installation of Windows is preserved so
you can dual-boot between both versions.
However, you cannot upgrade to Windows NT Workstation 4.0 from Windows 95.
In addition, you cannot install Windows NT Workstation 4.0 in the same
folder as an existing Windows 95 installation. To install Windows NT
Workstation 4.0 on a computer running Windows 95, you must install it in a
new folder. After doing so, you can dual-boot Windows 95 and Windows NT,
but you must reinstall your Windows-based programs for them to function
properly in Windows NT. In addition, any custom settings that are present
in Windows 95 will not be present in Windows NT.
The inability to upgrade an existing Windows 95 installation is a known
limitation of Windows NT Workstation 4.0 that will be addressed in a later
version of Windows NT Workstation.
There are two primary reasons that Windows NT Workstation 4.0 cannot
upgrade Windows 95:
- The registry structure is not identical in Windows 95 and Windows NT
Workstation 4.0. This causes many programs to store settings in one
location when you install the program in Windows 95 and store the
settings in a different location when you install the program in
Windows NT. Therefore, when you install Windows NT Workstation 4.0 over
Windows 95, the Windows NT Setup program is unable to transfer the
settings from the Windows 95 registry to the Windows NT registry.
- The Windows NT Workstation 4.0 Setup program cannot determine which
devices Windows NT Workstation 4.0 does not support. In addition,
Windows 95 supports more devices than Windows NT Workstation 4.0,
so it is possible for a device that is not supported by Windows NT
Workstation 4.0 to be installed and functioning properly in Windows 95.
Because the Setup program cannot determine which devices Windows NT
Workstation 4.0 does not support, it cannot prevent the installation
process from proceeding on a computer that contains an unsupported
device. This may cause the installation process to fail, or may cause
the device to fail or other problems to arise after the installation
process is finished.
To install Windows NT Workstation 4.0 on a computer running Windows 95,
follow these steps:
- Check to see if the devices installed in your computer and the programs
that you currently use in Windows 95 are supported by Windows NT
- Install Windows NT Workstation 4.0 in a new folder, and then verify
that you are able to successfully dual-boot between Windows NT and
Windows 95. Note that installing Windows NT Workstation on the same
drive on which Windows 95 is installed is not recommended.
- Reinstall any Windows-based programs that you want to use in Windows NT
Workstation 4.0. If the program you are reinstalling has separate
Windows 95 and Windows NT versions, be sure to install the Windows NT
version of the program instead of reinstalling the Windows 95 version.
The Windows NT version of the program should not be installed in the
same folder in which the Windows 95 version is installed.
- If you do not want to run Windows 95 after installing Windows NT
Workstation 4.0, manually remove the Windows 95 folder.