Microsoft Windows 7 OEM Reactivation

I had a desktop clone computer and the motherboard needs to be replaced because its faulty. And now I've canvassed for motherboard with same model as my existing so that I can save up the trouble of reinstalling my operating system on the new one and to save time so that I can use my computer immediately. But unfortunately I cant find one, they told me the motherboard I am looking is already phaseout and they suggested buying another newer motherboard. So, then Ive bought another motherboard which they had suggested and I need to buy another processor plus a new memory. Thanks to the fast technology nowadays Ive doubled my expenses! When done mounting my motherboard, processor and memory and turn on the computer, my Windows 7 Pro says I need to reactive my existing copy Windows with in 3 days due to some hardware changes on my computer.

So, I activate it online and it says the product key entered cannot be activated. I tried it a couple of times and I've double check the keys and tried it again but no luck. So, Ive emailed the Microsoft regarding of my problem and got this reply from them.(Ive got this reply after 24 hours of business day as they told me)

The email says, the reason why I cant activate my copy of windows is that its an OEM copy and according to EULA it can only be activated once. So my head start shaking! So Microsoft telling me to buy another operating system? Really? As an alternative, I wanna try to activate this copy through phone and try my luck. And I got the installation id's and call the Microsoft Toll Free 1800-1441-0158 using (PLDT line). After getting the installation id's the Microsoft Automated Voice give me I activate my windows again, but you cannot activate through phone directly without passing through the online activation process so I try to activate it online, and I am surprised my copy of Windows 7 Pro is successfully activated. I do not know what happen but this time Im lucky to activate it. If not i want to try activating it using the installation id's that I got from Microsoft. I think its no longer needed. I've just got lucky this time!