[問題]Windows 7 Upgrade

我係Student Select度買左個Upgrade Version返黎, 佢要12月先有得拿, 但係我又心急想試下個Windows 7先, 想問下, 我可唔可以用Windows 7的Full version黎upgrade我個XP先, 唔activate佢住 (不停rearm), 直到12月我拿左條key後, apple返條key落去變返正版架?