Microsoft Windows XP may delete or modify the autoexec.nt file when upgrading to Service Pack 2 (SP2). This file in not needed by the Microsoft Windows XP Operating System. However, if is required for some 16-bit DOS and legacy Windows applications to run.
The error message you are seeing will occur if the 'autoexec.nt' file is missing or corrupt.
The fis involves copying a good copy of the file to the correct 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.
Let me know if this fixes your issue.