I am trying to Install VB6 Enterprise Edition but I keep getting the following error:

C:\WINDOWS\SYSTEM32\AUTOEXEC.NT. The system file is not suitable for running MS-DOS and Microsoft Windows Aplications. Choose 'Close' to terminate the application.

Now, I've had this issue previously with some older games I've tried to install and they at the game company told me how to fix it but taht was ages ago. Does anyone here know how to solve thsi issue? Help would be much much appreciated.