Dell 4550 P-4 w/120g hd kept hanging up regardless of what I tried. Would freeze up during loadind. I attached the drive to my computer through USB to separate HD cable and formated the drive. It was loaded to the max with viri. My question is, how can I get the reinstall disk (Dell) to be recognized for boot. I've gone into setup and made boot sequence for CD checked and top of the list. It is now saying NTLDR missing and it's driving me crazy. Any help will be greatly appreciated.