The System is showing “No system disk”, disk boot error

The System is showing “No system disk”, disk boot error

1. Enter the computer’s BIOS and make sure the Boot from CD is first, above the Boot from Hard Disk. If you haven’t set this, it won’t boot from the CD, it will try booting from the Hard Drive.
2. Use your pc’s last known good configuration feature which will enable you to undo changes that might have caused the issue.  To use this feature, restart your pc and pressing the F8 key on the keyboard.  This will display the Windows Advanced Option window.  Move the down arrow until you can select the Last Known Good Configuration from the menu and then press the Enter button.
3. Use a System Restore which might be helpful in rebooting your pc correctly.  To use this feature, restart your pc and press the F8 key on your keyboard.  This will display the Windows Advanced Option window.  Move the mouse arrow until you can select Safe Mode and then press the Enter button.  Once the pc has booted in Safe Mode, click Start > All Programs > Accessories > System Tools > System Restore.  Click on the Next button and follow the wizard onscreen.
4. If the partition boot sector has become corrupt, your windows will not start properly.  If you are able to boot the computer with the Windows XP CD, open the Recovery Console and type the following command in the prompt: Fixboot [drive] : Replace the [drive] with the letter of the drive where you want to make the new partition.