Check It Out: SQL Server Management Studio Express SP2

If you’re running SQL Server 2005 Express Edition on the x64 platform, you'll definitely want to check out the Microsoft download for SQL Server Management Studio Express Service Pack 2 (SSMSE SP2). Earlier versions of SSMSE wouldn't run on the x64 platform even though SQL Server Express ran as a 32-bit application using Windows x64 Windows on Windows (WOW) support. SSMSE SP2 will run on Windows x64 as long as the 64-bit version of the .NET Framework 2.0 is available. You can download SSMSE SP2 at:
http://www.microsoft.com/downloads/details.aspx?FamilyID=ccbda432-8ecf-4c82-bdef-b575eaf07f55&DisplayLang=en