NoteHKLM\SOFTWARE\Policies\Microsoft\Windows\Installer
| Data type | Range | Default value |
|---|---|---|
| REG_DWORD | 0 | 1 | 0 |
Prohibits Windows Installer from generating and saving the files it needs to reverse an interrupted or unsuccessful installation.
This entry prevents Windows Installer from recording the original state of the system and the sequence of changes it makes during an installation. It also prevents Windows Installer from retaining files it intends to delete later. As a result, Windows installer cannot restore the computer to its original state if an installation does not complete successfully.
This entry stores the setting of the Disable rollback Group Policy. Group Policy adds this entry to the registry with a value of 1 when you enable the Disable rollback policy. If you disable the policy, Group Policy sets the value to 0. If you set the policy to Not configured, Group Policy deletes the entry from the registry and the system behaves as though the value is 0.
| Value | Meaning |
|---|---|
| 0 (or not in registry) | The policy is disabled or not configured. Windows Installer can generate and save the files it needs to reverse an interrupted or unsuccessful installation. |
| 1 | The policy is enabled. Windows Installer cannot generate or save the files it needs to reverse an interrupted or unsuccessful installation. |
This entry is designed to reduce the amount of temporary disk space required to install programs. Also, it prevents malicious users from interrupting an installation to gather data about the internal state of the computer or to search secure system files. However, because an incomplete installation can render the system or a program inoperable, do not change the default behavior unless it becomes essential.
To change the value of this entry, use Group Policy. This entry corresponds to the Disable rollback policy (Computer Configuration\Administrative Templates\Windows Components\Windows Installer).
Note
This entry can appear in both HKEY_LOCAL_MACHINE and HKEY_CURRENT_USER. If this entry appears in both subtrees, the value in HKEY_LOCAL_MACHINE takes precedence over the value in HKEY_CURRENT_USER.
Tip
For detailed information about particular Group Policy settings, see the Group Policy Reference (Gp.chm) on the Windows 2000 Resource Kit companion CD.
For general information about Group Policy, see Group Policy in Windows 2000 Help.
To see a table associating policies with their corresponding registry entries, see the Group Policy Reference Table.
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