At my friend's advice, I went into BIOS and selected "load optimum defaults" and hit save and exit. Now on the next boot-up, I received the error message "System boot failure, insert system disk and press enter" So I inserted my reinstall disk for Windows XP Media center edition, but that didnt help. I then formatted and reinstalled windows, but I still get the same error message. Since then I have tried running "fixmbr" "fixboot" "chkdsk" and resetting my bios, but still no luck in fixing the problem. It was working fine on my old computer, and I switched the HDD to my new one and it ran fine until i loaded optimum defaults, and now it doesnt. What should I do to fix it?