x2,
because windows reserves a chunk of the harddisk which is called a boot sector that contains all the necessary info to boot that particular motherboard it was installed on. certain chipset driver information is on there along with other info it needs to get past the bios post and move to the os enviornment. so when you change that you have to reinstall everything or at least repair your current windows installation to accept your new motherboards driver information. --------------------------- ACID ----------------------