I have win 7 pro OEM installed on my custom computer. I am trying to change my ASUS P6T Sata setting in BIOS to AHCI. I Get a blue screen when I do this. According to ASUS I must reinstall Windows which is not an option since I have tons of applications installed or they said I can do a repair. Like other MS OS's there is a repair when first booting but I need to use the repair option you normally get after starting the installation when it sees you already have the OS installed. This is what ASUS said and I have done in the past with other OS's. However unless I am missing something on my WIN 7 64 bit OEM install when I start the install it sees my drives and partitions and my only option is to pick the partition to install to and it it does a full install. Am I missing something? Any other workarounds or suggestions?