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?

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.