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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