First you must boot from a CD or DVD or from a floppy disk and not from the hard drive.
Creating a Windows XP boot disk
Note: The Microsoft Windows XP CD is a bootable CD and in many cases you should not need a bootable floppy diskette. Booting from the Windows XP CD will allow you to not only install/re-install Windows XP but will also allow you to troubleshoot it.
Create MS-DOS bootable diskette
When formatting a floppy diskette, users have the option of creating a MS-DOS startup disk, follow the below steps to do this.
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Place diskette in the computer.
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Open My Computer, right-click the A: drive and click Format.
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In the Format window, check Create an MS-DOS startup disk.
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Click Start
How to boot from Microsoft Windows XP CD.
1. Restart the computer while it is rebooting keep on tapping on F12
2. In the boot menu option select on CD/DVD Rom the press Enter
3. Computer will restart and you will be prompted to " Boot from CD/DVD press Any key" just press any key on your keyboard. Just the let the Windows Setup files be loaded.
4. Press "R" when you the screen below
5. Press 1 then Enter
6. In the command prompt type format c:/q then press Enter
Note: This will format the drive c: or wipe out the information in the hard drive
I had already changed boot order in the BIOS...
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