Last year I bought a laptop that included Windows Vista Home Premium, OEM version. As I bought it for my linux work and am not fond of Vista, I would like to replace it by Windows XP or make a Virtual machine that runs XP.
Is it possible to legally downgrade my Vista version to XP without paying for an extra XP licence? There is some text in the Vista license about downgrading but I cannot understand it.
Can I just use my Vista license number for XP?
I'm talking here about how to do this in a legal way, not technically. I do not care for the data that's now on my system, I just as well would like to do a clean reinstall.
(I do not like Vista because of the strict administrator policies and the memory overhead, but that's not what this question is about.)