MSSQLSERVER has nothing related to "File and Print Sharing Services", it's Microsoft SQL Server which is required to run Silent Storm games. For XP it's neccessary to install Microsoft sql server desktop engine(MSDE), usually it's installed together with the game. But it's impossible to install MSDE on windows vista and newer windows versions.
You may try to install Microsoft SQL Server 2012 Express, to make
Cant open "MSSQLSERVER" service:
The specified service does not exist as an installed service.
message disappear, but you'll have to set up the server so, that the map editor could connect to SQL Server. Because there will be next error about user "sa" which cannot connect to the database. Even if you setup the sa user password correctly, and the editor manages to connect to the database. The server won't allow you to use it, because Microsoft SQL Server 2012 will be unable to upgrade the database...
So it really sucks...