My motherboard died, and I had to change it.
Does this mean that i need to reinstall Windows-7 ?
Or can I make it load somehow, and then just install the new board's drivers ?
It should work without reinstalling. I guess you have new motherboard which is different then the one you've had before. Unless there are some big changes there should be no problems for Windows 7 to find changes and update accordingly.
In worst case scenario you can fix Windows by starting it up from DVD and choosing repair option (in case anything in
But I would suggest posting exact problems you have (full error message) and checking bios settings.
You can boot your computer and then install the new drivers required by your new motherboard.
And you don't need to reinstall Windows 7.
You only need to install any new drivers required by your new motherboard.
The other cases were already handled by the other answers. But let me add one consideration:
Should you have used a TPM-based encryption - such as BitLocker - things would be a bit more complicated. It is possible, though, to create recovery media for this in advance. If you haven't done this, you're out of luck and would also have lost the data on any BitLocker-secured drives.