Hi, I compressed my C drive on which I have my Windows XP OS. Now, all I am getting is "BOOTMGR compressed press Alt+Ctrl+Del to restart". I can't use my CD ROM on the desktop because it is broken but I did copy and paste the XP OS files from CD on to my external HD using my laptop. After copying the XP files on to my external HD, I have connected the external HD to my affected desktop via USB port and changed the first booting device to USB drive in the BIOS set-up but still getting the same "BOOTMGR press Alt+Ctrl+Del to restart" msg.