Creating a product key

I am building a program and want to have an individual product key for each computer it is installed on. what I want the product key generator to do is pull the windowsxp product id (from the registry) [should look something like 03853-OEM-9886493-23114] and change the ascii values of the letters by, say 4. the generator will have 8 textboxes total 4 on top (03853-oem-9886394-23114) and 4 on the bottom (which will be the key generated) and a generate button. when the program starts it will automatically pull in the xp product id to the top 4 textboxes. I will also need the source-code.. Thanks much. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform This will be running on windows xp home 1.3 ghz celeron processor 64mb ram. 10 gig hard drive.