Command needed to FIND & REPLACE a literal value throught a directory

I need a command that will allow me to FIND a literal value and REPLACE that value with another literal value, throughout a directory or hierarchy of directories. It's ok if it actually duplicates the directory containing the new values! Apparently, i don't have sed on my system! ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Exclusive and complete copyrights to all work purchased. (No GPL, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site). ## Platform Windows XP, Dos