That is why when I received my free copy of Windows Vista Business edition, I called microsoft's anytime upgrade line and asked PRIOR TO purchasing if I could do a clean install with the upgrade I purchase through the anytime upgrade. They tell me "Yes, it wont be an issue". I even verified to them what a clean install was. I told them that I meant on a fresh hard disk, without installing another OS first, they said "Yes sir, no problem". Well, I purchase the upgrade to ultimate and guess what, WRONG.
So what did I do? I took names of who I talked to and called back, spent 2 hours on the phone, talked to 6 diff people, and now I have a full working key to Windows Vista Ultimate. All I can say to this is, watch out companies, what you tell your customers, they will hold you to it. Just like the guy who was told by verizon that his data rate was 2 hundredth's of a cent and not 2 hundredths of a dollar. Be careful what you say!