VSS

Microsoft Visual SourceSafe (VSS) is a source control software package oriented towards small software development projects. Like most source control systems, SourceSafe creates a virtual library of computer files.

-- Install .Net Framework and VSS (Visual SourceSafe).

-- Create users who want to access & be allowed to edit these files in VSS & assign passwords to them.

-- Create a project in VSS & folders.

-- Add files in the respective folders by choosing working folders.

-- Right-click on file & select 'Get latest version' to get the read-only copy of latest version of a file.

-- Right-click on file & select 'Check-out' to get the writable copy of latest version of a file.

-- Right-click on file & select 'Check-in' to upload the copy of latest version of a file.

-- Files not required can be deleted from VSS & then can be removed from local working folder also.

-- It is not possible for multiple users to check-out copy of same file at a time.

Link to download VSS:-
http://www.microsoft.com/en-us/download/details.aspx?id=291