only the very simplest programs/games will allow this. And the missing registry entries will cause a lot more hassle than just asking for the cd. fact.I disagree. Most games programs act as sort of a client to DirectX so the only thing it does to the registry is add a program entry and it does not add any files to the Windows system. If you transfer the directory and any files it has put into MyDocuments, the program will run properly but it will ask you to re-enter your CD key for the registry program entry.