Search and Update Multiple files in a folder

I have a 3 problems/questions. I have a folder called scripts which is located in the following directory: C:\Inetpub\wwwroot\serversites\scripts\ That folder contains a couple hundres text files. I need to write a script that will open up the folder (or just know where to look), search through all the files, find a certain word and replace that word with another. I have done this using Perl but thats obviously a different flavor. Can someone tell me where I should start off and what functions/tags I should consider using? Thanks for the help!