How to remove Windows NT or Windows 2000 from computer

Make sure you know where Windows NT or Windows 2000 is installed, how much of it you want to remove, and how your hard disk is partitioned and formatted. Then, use the information in one of the following sections in this article:

• Removing Windows NT or Windows 2000 from the Boot Sequence
• Removing a Primary NTFS Partition
• Removing Windows NT or Windows 2000 Files

NOTE: If the hard disk contains a partition that uses the NTFS file system, remove this partition in Windows NT or Windows 2000 before removing Windows NT or Windows 2000 from the boot sequence.

Removing Windows NT or Windows 2000 from the Boot Sequence

There are two ways to remove the Windows NT or Windows 2000 boot sector from your computer:

• If you want to return to your original MS-DOS configuration, boot MS-DOS and type sys c:. This command replaces the Windows NT or Windows 2000 boot sector with the MS-DOS boot sector, and enables your computer to boot MS-DOS. The following files are left in the root folder and can be deleted after you perform the sys c: operation:
  
  Pagefile.sys
  Boot.ini
  Ntldr
  Ntdetect.com
  Ntbootdd.sys
  
  NOTE: The Ntbootdd.sys file is installed only if you have a SCSI Host Adapter installed in Windows NT or Windows 2000.
  
  You can also start your computer with a Microsoft Windows 95 or Microsoft Windows 98 bootable floppy disk and use the sys c: command if you want to return to your original Windows 95 or Windows 98 configuration.
  
  
• If you want to leave Ntldr on the disk, you can boot MS-DOS without being prompted by changing the startup operating system and time-out value. To do so, start the System tool in Control Panel, click the Startup/Shutdown tab, click MS-DOS in the Startup box, and then type 0 in the Show List For n Seconds box.
  
  NOTE: If the primary partition was converted to NTFS, the only way to return to starting MS-DOS automatically is to reformat the drive and reinstall MS-DOS. See the next section if this is the case.
  

Removing a Primary NTFS Partition

In general, attempts to modify the primary, bootable NTFS partition do not succeed for the following reasons:

• MS-DOS versions 5.0 and 6.0 do not recognize an NTFS partition. The MS-DOS Fdisk program reports an NTFS partition as an OS/2 high-performance file system (HPFS) partition.
  
• You cannot modify or delete an NTFS primary partition within the partition.

To delete or modify a primary NTFS partition, use any of the following methods:

• Boot MS-DOS version 6.0 from a floppy disk and press RETURN to continue installing MS-DOS 6. When you are prompted to do so, choose Remove Files.
  
• Initiate Windows NT Setup from floppy disks or a CD-ROM. When you are prompted to do so, press P to remove the partition.
  
• Use the Delpart tool (Delpart.exe) to delete the NTFS partition. The Delpart tool is included with the Microsoft Windows NT 3.1 Resource Kit only. It is not included in the Windows NT 3.5, 3.51 or 4.0 Resource Kits.
  
• Boot OS/2 version 1.x from a floppy disk and run its Fdisk program. To remove the partition, specify the /D option.