Article ID: 132545 - View products that this article applies to.
This article was previously published under Q132545
This article has been archived. It is offered "as is" and will no longer be updated.
The Special Step-Up Edition of Windows NT 3.51 can be used to upgrade from Windows NT 3.5 to Windows NT 3.51. The Special Step-Up Edition runs only on computers with Windows NT 3.5 or Windows NT 3.51 installed. If Windows NT 3.5 or 3.51 in installed on a computer, you can use the Special Step-Up Edition to upgrade that copy to Windows NT 3.51, or install Windows NT 3.51 into a new directory. The Special Step-Up Edition cannot be used to upgrade or install over Windows NT 3.1.
NOTE: The Windows NT repair procedure also uses these steps to detect a Windows NT installation to repair. If NTOSKRNL.EXE and NTDLL.DLL are corrupted, the repair process may fail reporting it cannot locate a Windows NT installation. It is possible to expand and copy NTOSKRNL.EXE and NTDLL.DLL to the %SystemRoot%\System32 directory to allow the repair procedure to continue.
The Special Step-Up Edition setup program checks the following to verify that an upgradable copy of Windows NT 3.5 is installed on the computer:
Windows NT 3.5 and Windows NT 3.51 Setup use the same steps listed above when looking for previous installations of Windows NT. The only difference is, the Special Step-Up Edition setup program requires the presence of an upgradable copy of Windows NT 3.5.