Source Control (free if possible) that work great over the web

Hi, i need to get a good and efficient source control, preferably free or that cost under 100$) that can be installed on a windows 2003 server (for the server part) and for the client that work under winXP and Vista over the web. the person that i will choose will have to give the url to download all utilities and also give good reason why we should choose this source control. the person should also provide a step by step installation guide for both the server installation and client installation and use. ## Deliverables Hi, i need to get a good and efficient source control, preferably free or that cost under 100$) that can be installed on a windows 2003 server (for the server part) and for the client that work under winXP and Vista over the web. the person that i will choose will have to give the url to download all utilities and also give good reason why we should choose this source control. the person should also provide a step by step installation guide for both the server installation and client installation and use.