Hello, I've read lots of posts on this and other forums, about how to create a universal installer, and am happy with the ei.cfg method, but I wonder if it can go further... I'm only really interested in 64-bit so don't need to extract and use WAIK. I need to sometimes install as OEM and sometimes as RETAIL (because I believe an OEM key won't activate a RETAIL installation - is that correct?). Is it possible to do this on one install source? Many thanks, Steve