File Change

Previous posting I think was not clear enough. Here is my problem. I have about 500 computers that have the attatched config file. Each config file is unique for each store location. The server it points to is no longer working so the program is not responding to hundreds of users. They keep calling all day and we have to remote in and fix the file manually. This consumes alot of time. This is why I need a script to put on my website that will change a text file on the local computer. The file is located in program files/opsilite/bin in each computer. The file is called opsi.exe.config. It is a text file that can be edited by noted pad. I have attatched the file. I have created a webpage for our clients to go to. I just need a aspx file created to fix theier computer. This job needs to be done by Sunday yes that is tommarow. In this file the follow line must be the only thing changed. Old: <add key="SQLServer" value="opsi.sqlfirm.net"/> New: <add key="SQLServer" value="sql.archfitters.com"/> The web link needs to make this change once clicked and then inform the client that the update is complete.