it is fully genuine and will activtae 100% guaranteed..i got the key from the sticker on side of my new comp. that use to run vista...its a first come first serve deal...
btw, its vista ultimate genuine key
edit: if you don't belive me, i have been doing trades on other sites...i can refer u to people that i have done offers with...
If you got that off a prefab system then it may not work for a retail or oem copy. I'm not real sure about the legal aspect of what you're doing. Besides if you activated that system then it's been logged to the set up of that rig.