Installing Visual Studio 2008 SP1 problem

I am trying to install SQL Server 2008 but it tells me that "Previous releases of Microsoft Visual Studio 2008: Failed". I downloaded Visual Studio 2008 SP1 from here VS2008 SP1, installed it (it said that the installation was successful), restarted the machine, but nothing has changed in Visual Studio Help -> About and the SQL Server 2008 Setup still tells me th开发者_StackOverflow中文版at Visual Studio 2008 is not upgraded to the SP1.

Does anybody know what is going wrong?

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I've run into this issue several times. Visual Studio and SQL Server are heavily integrated, and I have botched many installations by installing things with special setups. It is probably easiest at this point to uninstall VS, install SQL, then reinstall VS.