The problem:

Sometimes this error occurs when installing or re-installing v6 on
Windows XP SP2:

C:\>ipv6 install
Failed to complete the action.
Error 0x800704b8

C:\>netsh int ipv6 install
An extended error has occurred.

The solution:

Repair the security database:

esentutl /p %windir%\security\Database\secedit.sdb

Then try the install again:

ipv6 install

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