I got a decent computer from Best Buy about a year ago and just plucked a 4850 into it for my gaming needs. Now I'm looking to upgrade to an i5 proc and a new mobo. My friend says that my version of windows vista is tied to my motherboard and I'll have to buy a new copy of windows to make windows run. Is this true? Cus then it'll turn a $300 upgrade to about $500.