Knitware Install Error - Autoexec.nt - System File not
suitable for running MS-DOS
Depending on the system configuration, Microsoft Windows XP may delete
or modify the autoexec.nt file when upgrading to Service Pack 3 (SP3).  

Although this file is not used by the Microsoft Windows XP operating
system, it is required for some Windows applications (such as Knitware) to
install correctly.

Therefore, if the autoexec.nt file is missing or damaged when a Knitware
program is installed, this error message may appear.
This problem can often be corrected by restoring the missing or
damaged file to the System32 folder. The file originally resided on the
system before being deleted or damaged, and the original version of the
file can be found in the Repair folder.
To copy the autoexec.nt file from the Repair folder to the System32
folder, perform the following steps:
  1. Click the Start button, right-click My Computer, and then click
    Explore.  (Note: For Microsoft Windows XP systems running in
    "Classic mode", right-click My Computer on the desktop and then
    click Explore)
  2. The My Computer explorer window appears.
  3. In the left pane, click the [+] sign next to your primary local hard
    drive. This is normally your C: drive.
  4. In the left pane, click the [+] next to the Windows install
    directory.  (Note: For most systems, this is the Windows folder.
    On some client systems, this is the WINNT folder.)
  5. In the left pane, scroll down and click the Repair folder.
  6. In the right pane, right-click autoexec.nt and click Copy from the
    menu that appears.
  7. In the left pane, scroll down and click the System32 folder.
  8. In the right pane, right-click on any blank space inside the
    window and click Paste.
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