Service Pack Upgrade Issues

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System Enhancements

The upgrade to a Service Pack should have no effect on post-installation enhancements of Windows NT services, such as FTP Server. No special considerations are required for Microsoft-supplied optional features for Windows NT.

Third-party Software

On the contrary, special considerations are required for third-party software that replaces or adds files with the same name as Windows NT system files.

The only known instance of this is vendor-provided Hardware Abstraction Layers (HALs). When you have a special HAL from an original equipment manufacturer (OEM), you need to reinstall that HAL after you run the Service Pack Update program. UPDATE.EXE reads the SETUP.LOG file and if it sees that the system used HALSP.DLL, for example, when it was originally set up, it will copy that file from the Service Pack over the top of the HAL.DLL resident on the hard disk. In this situation, install the Service Pack and copy the HAL supplied by the third party back onto the hard disk before you shut down and restart your computer.

Unexpected Results

As with any modification of system software, proper care should be taken in preparing for unexpected problems. For Windows NT, this includes having the following before you make any modifications:

• A tape backup of the machine's data.
• A backup of the disk configuration.
• A backup of the Registry.

If a serious problem arises after you install a Service Pack, do the following:

1. Use the Emergency Recovery Disk. This returns Windows NT to the original condition ("as installed" format).
2. Restore the Registry.
3. If necessary, restore the disk configuration.
4. If appropriate, reinstall the Service Pack and any additional software.

This can be done in situations where the problem is not believed to be inherent to the Service Pack itself. An example of this kind of situation would be neglecting to reinstall third-party software after you install the Service Pack and before system shutdown. Another example would be a power failure when you are installing a Service Pack.