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Try applying SQL Server 2008 SP1 which might help sometimes.<br />
As a faster fix, try restoring backup directly using TSQL statement which would work:<br />
<br />
<a href="http://social.msdn.microsoft.com/Forums/en/sqldisasterrecovery/thread/9f29c16b-d783-406e-94f2-22720b8993b4" rel="ugc nofollow">http://social.msdn.microsoft.com/Forums/en/sqldisasterrecovery/thread/9f29c16b-d783-406e-94f2-22720b8993b4</a>
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Try applying SQL Server 2008 SP1 which might help sometimes.
As a faster fix, try restoring backup directly using TSQL statement which would work:

http://social.msdn.microsoft.com/Forums/en/sqldisasterrecovery/thread/9f29c16b-d783-406e-94f2-22720b8993b4 [http://social.msdn.microsoft.com/Forums/en/sqldisasterrecovery/thread/9f29c16b-d783-406e-94f2-22720b8993b4]

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I'm trying to restore a backup into a blank database i.e. no tables. I get the following error<br />
<br />
Specified cast is not valid (SqlManagerUI)<br />
<br />
Is this because there are no tables in the database?
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I'm trying to restore a backup into a blank database i.e. no tables. I get the following error

Specified cast is not valid (SqlManagerUI)

Is this because there are no tables in the database?

restore MS SQL Server backup error - specified cast is not valid (SqlManagerUI)

Microsoft SQL Server 2008 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. Major improvements include the  Always On technologies and support for unstructured data types.