My PC is unable to boot from Windows XP SP2 CD. Earlier it could boot very easily but now it is not booting. My CD-ROM can read any CD, so it's working fine. The Boot order in BIOS is correct. When I change first device in Boot order to CD-ROM and the rest disabled, it shows "SYSTEM DISK ERROR, PRESS ENTER". And when second device is set to Hard Disk, the system haults on screen where it says to "Press any key to load from cd" (althought this message is not displayed). And before this message is displayed, it loads the preinstalled windows. Please help. Thanks is advance.