title: upgrade visual studio to sp1
body: <p>i'm going to install sql server 2008 on my computer,during preparing the installation there was an error like this: </p>
  
  <p>a previous release of Microsoft Visual Studio 2008 is installed on this computer. Upgrade Microsoft visual studio 2008 to sp1 before installing SQL Server 2008.</p>
  
  <p>So i should upgrade my visual studio to sp1, but i don't know how to do it. </p>
  
  <p>Please help, and Thanks.</p>