I bought a Windows 7 Upgrade Family Pack which is good for use on 3 PCs. The first PC I used it on had it's motherboard (Intel P67) bricked by a bad flash from Intel. I replaced the motherboard and re-used the same CPU and got Microsoft to activate it online. I then built another computer and used the same Product Key from the Windows 7 Upgrade Family Pack and again got Microsoft to activate it online. Now I've built a 3rd computer and when I tried to get Microsoft to activate it online it didn't work. Instead it's asking me to buy another Product Key. I'm thinking that Microsoft thinks that the 1st computer that I used the Product Key on is still around. How do I get them to remove that 1st computer from the license so I can activate the new one? I'm not spending money to but another license when the license I have is good on 3 computers and I only want to use it on 3 computers. Thanks.