Have a L7VMM3 mobo with AMI Bios. Had Win 2000 installed and running. Tried to upgrade to XP and had wierd message asking for VINYL Codec (I wasn't there so cannot verify) Computer hung and got "windows had trouble booting screen. Nothing worked. Retried installing XP, got message "Error loading operating system". Went back to WIN 2000, deleted partition from 2000 install routine, repartitioned and formatted. Continue to get same error message "error loading operating system, or if I bypass the cd and try to load from hard drive, get "no operating system error". Anybody have any ideas? This system is 6mo old. New Mobo and hard drive.