My asus motherboard sound stopped working and ncix is going good on the motherboard. Do I need to re-install windows when replacing the motherboard with the exact same one?
No, because your hard drive probably has an operating system so you can just plug the sata/ide connection of your hard drive to the motherboard.
It doesn't matter if the operating system is installed. If the motherboard is exactly the same it should work without a problem. Source: Tried and tested over 30 times.
You shouldn't have to. I did the same a few weeks ago with a Gigabyte mobo and just plugged in my SSD from the previous motherboard with the Windows installation already on it. No problems at all.
You may have to reactivate windows though, although I didn't have to.
No, because your hard drive probably has an operating system so you can just plug the sata/ide connection of your hard drive to the motherboard.
It doesn't matter if the operating system is installed. If the motherboard is exactly the same it should work without a problem. Source: Tried and tested over 30 times.