Most people get Windows preinstalled on computers they purchase. Windows activation is another hurdle in the process. RELATED: How Does Windows Activation Work? The Licensing Problem: Windows Activation When Windows boots on different hardware, it doesn’t know how to handle that hardware and won’t boot properly. The drivers for the storage controller, which allows the motherboard to communicate with the hard disk, are particularly important. That’s because when you install Windows on a computer, it sets itself up with drivers specific to that computer’s motherboard and chipset. You may see an error about problems with the “hardware abstraction layer” or “hal.dll”, or it may even blue-screen during the boot process. If you actually try moving a Windows drive to another computer and booting from it–or restoring a Windows system image backup on different hardware–it usually won’t boot properly. Microsoft probably has some algorithm that decides what is the same machine and what not, but till this day a haven't seen a clear answer how it works.RELATED: 8 Backup Tools Explained for Windows 7 and 8 Even with OEM licenses that are not in BIOS, you can change the mobo on failure, but I assume that you can't upgrade CPU at the same time, as it would constitute as "different machine". If you buy a computer with preinstalled key in BIOS and change the mobo with the same one, than you're OK, as far as I know. Qestion is what is a "different machine".
The problem arises when there were significant changes in hardware, like changing RAM, CPU and Mobo, then Windows will probably not activate automatically, but you still can. You can change HDD and you can change RAM.
Preinstalled key is this days written in BIOS, but that does not mean it's tied to it. OEM license is tied to the whole system and not only motherboard or disk.
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