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Windows XP suddenly won't run 16 bit programs

Windows XP suddenly won't allow 16 bit programs to run
PROBLEM: Windows XP won't allow 16 bit programs (like ProTEXT) to run.

When you try to run ProTEXT, XP gives you an Error Dialog stating:
16 bit Windows Subsystem C:/WINDOWS/SYSTEM32/AUTOEXEC.NT
The system file is not suitable for running MS-DOS and Microsoft Windows applications.
Choose 'Close' to terminate the application. [Close] [Ignore]

EXPLANATION: Your XP computer has been infected by a Virus.
One website HERE thinks this is a Trojan Virus named: TrojanDownloader.Win32.Dia.a
This virus has corrupted 3 important Windows XP system files.
The virus might or might not return after your XP system is restarted.

The EASY Fix
A Company, Named "Visual Tour" has written a FREE utility to repair these 3 files.
The utility is named "XP_Fix.exe", and can be found at their website:
  www.visualtour.com/downloads/
Go to their website, Click on their "XP_Fix.exe" link, then Press "Run".
By doing that, you will run their tiny utility program which fixes your XP Problem.
The DIFFICULT Fix - ( Microsoft's Official Method )
TO FIX: You must restore the 3 corrupted XP system files back to their original contents.
You can read the complete Microsoft Support Article Here.

Basically, this article tells you to do this:
(This example assumes your CD-ROM is the D: Drive)
1. Insert the Windows XP CD-ROM into your CD drive
2. Click the Windows Start Button, then click Run
3. In the Open box, type cmd, and then click OK
4. At the command prompt, type CD\ then press Enter
5. At the command prompt, type the following 4 commands, pressing ENTER after each command.

expand D:\i386\config.nt_ c:\windows\system32\config.nt
expand D:\i386\autoexec.nt_ c:\windows\system32\autoexec.nt
expand D:\i386\command.co_ c:\windows\system32\command.com
exit