SQL Server Management Studio is the Microsoft utility that allows modification of settings and objects in an SQL Server (usually used by administrators or developers)
A Free version (Express) can be downloaded from Microsoft
http://www.microsoft.com/en-us/download/details.aspx?id=29062
(Search "Microsoft SQL Server Express" if the link above changes to find it in google or bing)
All related SQL files are found at that link
Download the "SQLManagementStudio_x86_ENU.exe" (for 32 bit platforms) or "SQLManagementStudio_x64_ENU.exe" (for 64 bit platforms)
Run the file and perform a FULL standard install.