Rollback is disabled in the DisableRollback policy in the registry. The DisableRollback policy value may have been set by an administrator. Microsoft recommends that administrators do not disable rollback unless this is necessary.
There are two places in the registry where the DisableRollback policy value can be set. To resolve this problem, you must find out where the DisableRollback policy was set and remove or disable the setting.
To find out whether this property exists in your registry, run C:\Regedit.exe and check the following locations:
Article ID: 312499 - Last Review: Mar 15, 2008 - Revision: 1