Hmmm,

I've done exactly that with different versions of Windows, and it often works. What's the problem? Does MS's license tie a product key to a specific install media?
Be careful here.............you have two contracts, one with Microsoft and one with the OEM.

If you remove the OEM software you will have invalidated your software warranty. If you then go to Microsoft they will see that it is an OEM key and will tell you to go to your OEM provider for help.

They will support (to some extent) store bought OEM disk installations such as I sell, but not those from the "big boys". This is part of the business model. I would guess that the "big boys" are paying a third or maybe less than what I do.

As for the media, it shouldn't matter...............MS are licensing you to use software not selling you a coaster So, if you use any disk to do a repair, you should be OK as you have licenced software.

I have found that to be a pain with some CD/DVD devices that ship Nero, but only for that particular device................even two bought at the same time wouldn't accept the other's CD