Maybe you have already got this error while (re)installing IPv6 on Windows XP:
C:\>ipv6 install Installing... Failed to complete the action Error 0×800704b8
The fix has to do with the Windows security database, which may not be up-to-date. To fix this database, type the following command:
C:\>esentutl /p C:\WINDOWS\security\Database\secedit.sdb Microsoft(R) Windows(TM) Database Utilities Version 5.1 Copyright (C) Microsoft Corporation. All Rights Reserved. Initiating REPAIR mode... Database: C:\WINDOWS\security\Database\secedit.sdb Temp. Database: TEMPREPAIRxxxx.EDB Checking database integrity. Scanning Status (% complete) 0 10 20 30 40 50 60 70 80 90 100 |----|----|----|----|----|----|----|----|----|----| ................................................... Integrity check successful. Note: It is recommended that you immediately perform a full backup of this database. If you restore a backup made before the repair, the database will be rolled back to the state it was in at the time of that backup. Operation completed successfully in 4.469 seconds.
Once the above command is passed, everything should be ok.
C:\>ipv6 install Installing... Succeeded.
See http://support.microsoft.com/?scid=kb%3Ben-us%3B318711&x=10&y=14 for more informations.

