It isn't to do with chipset drivers, it is to do with the key itself. OEM keys are bound to the system they were first activated on, so any major hardware changes, even if they are upgrades, count as a new system. Swapping motherboard to one with a different chipset is seen as a major hardware change, and so as soon as you connect to the net, or even if you are when you first activate windows, you will be told that the key is already in use, which it is (was) on your old computer.
The OS you have is an OEM copy, so yes, your upgrades will require you to get a new copy of Windows. If all you use your system for is the internet, word processing, music pictures etc, you may not even need to buy a copy of Windows, just download a copy of Ubuntu, or get them to send you one, it can do everything that Windows can, but as it is a Linux distro, it is free. The only time any issues pop up is if you try to play games, as very few "major" games have Linux support
Yes but I was talking about it not letting you boot the system., As I said that when I did it (What did I do? I placed a HDD with XP into my current system and booted from that HDD) and it didn't work because it said in the boot process that it was missing a SPECIFIC file.
Nothing to do with Activation as far as Im concerned because I never managed to get to the OS at all