I have received six emails in last four days asking for the resolution of error when tried to open newly installed SQL Server Book On-Line.
Microsoft Document Explorer cannot be shown because the specified help collection ‘ms-help://MS.SQLCC.v9
1) Uninstall the versions of Book On-line (different languages, different releases etc) using Add-Remove programs tools.
2) Re-install SQL Server Book On-line.
Above solution is confirmed by MSDN site here.
Reference : Pinal Dave (http://blog.SQLAuthority.com)