Article ID: 132545 - View products that this article applies to.
This article was previously published under Q132545
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.