The first thing you need to download is MS SQL 2008 R2 Express Edition. The direct link is here:
64-bit: http://www.microsoft.com/downloads/info.aspx?na=46&SrcFamilyId=967225EB-207B-4950-91DF-EEB5F35A80EE&SrcDisplayLang=en&u=http%3a%2f%2fdownload.microsoft.com%2fdownload%2f5%2f5%2f8%2f558522E0-2150-47E2-8F52-FF4D9C3645DF%2fSQLEXPRWT_x64_ENU.exe
32-bit: http://www.microsoft.com/downloads/info.aspx?na=46&SrcFamilyId=967225EB-207B-4950-91DF-EEB5F35A80EE&SrcDisplayLang=en&u=http%3a%2f%2fdownload.microsoft.com%2fdownload%2f5%2f5%2f8%2f558522E0-2150-47E2-8F52-FF4D9C3645DF%2fSQLEXPRWT_x86_ENU.exe
SQL Server 2008 R2 Express requires .NET Framework v3.5, which can be obtained through Microsoft Update or from http://www.microsoft.com/downloads/en/details.aspx?FamilyId=333325FD-AE52-4E35-B531-508D977D32A6&displaylang=en.
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