If Your MS-DOS or Windows NT Operating System Does Not Boot

When you try to boot your computer running Windows NT or MS-DOS, the operating system does not boot and you receive one of the following messages: If you press a key to reboot, the message appears again.

NOTE: Depending on the manufacturer of the CMOS or BIOS the message text may vary.

The CMOS or BIOS of your computer displays this message on your screen if drive C, the primary partition on the first physical hard disk, is no longer marked as the active boot partition.

To resolve this problem, mark the primary partition active.

Your Computer Runs Windows NT

To mark the primary partition active, boot your computer with a Windows NT boot disk and run Disk Administrator. You cannot use the Emergency Repair Disk (ERD), because it does not mark the partition active.

If you do not have a Windows NT boot disk, you need another computer on which you can create a Windows NT boot disk:

• If you run Windows NT 3.1 on your computer and you have another computer available that runs Windows NT 3.1, please see the following article in the Microsoft Knowledge Base:
  101668  (http://support.microsoft.com/kb/101668/EN-US/ ) How To Guard Against Boot Failure with a Windows NT Boot Disk
• If you run Windows NT 3.5 on your computer, and you have another computer available that runs Windows NT 3.5, please see the following article in the Microsoft Knowledge Base:
  119467  (http://support.microsoft.com/kb/119467/EN-US/ ) Creating a Boot Disk for an NTFS Partition
• If you only have another computer available that runs MS-DOS, follow the instructions under Your Computer Runs MS-DOS below.

Your Computer Runs MS-DOS

To mark the primary partition active:

1. On a computer running MS-DOS, create a bootable floppy disk.
2. Copy the file FDISK.EXE from that computer's DOS directory to the floppy disk.
3. On your problem computer, boot from the floppy disk.
4. Run FDISK.EXE to mark the primary partition active.
5. Remove the floppy disk from the drive.
6. Reboot your computer to boot the operating system on drive C.