I keep getting the following error:

c:\windows\system32\autoexec.nt

This file is not suitable for running ms-dos and microsoft windows application.

Can somebody please help.

Click start, click run, type cmd, press OK
type the following: copy C:\WINDOWS\repair\autoexec.nt C:\WINDOWS\System32\autoexec.nt
then press enter.
press y then enter when prompted whether to overwrite

Then type exit and press enter, then try to install again