I recently replaced my old 1.6GHz Intel µp and SIS motherboard with a new 3 GHz µP and Intel genuine motherboard. I cannot use the OS in the old hard disk. The system re-boots repeatedly when I try doing it. The problem would be something of the drivers. If I replace all the system32 files the OS opens but I cannot do anything. If I replace only drivers, system reboots still. Can somebody help me and guide to me what files I must replace in system32 or what else I must be doing in order to open a OS in a Hard disk which has been installed with old drivers? Former is as stated SIS and the later Intel.