A recurring problem for me over the years is that when I upgrade a mobo, but using the same CPU and the same primary HDD, Windows will no longer boot off that drive. The culprit appears to be the different North Bridge and South Bridge chipsets. Rather than (once again) going through the time-consuming re-installation of the OS and hundreds of applications, I am wondering if there is a simple way to fix the boot sector without destroying any other data. In the current instance I am using XP Pro x64, for which (it is said) there is no Emergency Recovery Console or ERD Commander. Has some Russian genius written an independent "fix boot" utility?