16 bit Windows Subsystem

If anyone can help me figure this out I would be greatly appreciative. I recently had some virus and adware problems that I have gotten resolved. Now when I drop a game CD in (that played previously) I get an error message. It says:
16 bit Windows Subsystem
C:\WINDOWS\SYSTEM32\AUTOEXEC.NT. The system file is not suitable for running MS-DOS and Microsoft Windows Applications.

I am using Windows XP Home Edition.

Can anyone tell me what to do?

Bill

 

I think this will help.

http://support.microsoft.com/default.aspx?scid=kb;en-us;324767

 

I been struggling with the same problem for 3 weeks but found the cure today with this simple fix at this site:http://www.webuser.co.uk/cgi-bin/fo...0370&page=13&view=collapsed&sb=5&o=93&part=go down the page to:NickFlynn 22<<<he has the fix which helped me.boot after dowlnloading the fix.