Cannot Start Executable Programs (.exe Files) on Your Computer
http://support.microsoft.com/support/kb/articles/q311/4/46.asp
Exe Fix for XP (Line 12)
http://www.kellys-korner-xp.com/xp_tweaks.htm
Error Message: MS-DOS or 16-bit Windows-based program
http://www.kellys-korner-xp.com/xp_m.htm#16bit
This installaton program will reinstall the missing or corrupt Windows XP
system files command.com, autoexec.nt and config.nt. The absence or
corruption of one or more of these files causes a "16 Bit Subsystem" error.
XP_Fix.EXE by TRF Systems, Inc.
http://www.visualtour.com/downloads/xp_fix.exe

Signature
All the Best,
Kelly (MS-MVP/DTS&XP)
Taskbar Repair Tool Plus!
http://www.kellys-korner-xp.com/taskbarplus!.htm
>A few day ago my system was infected by a virus (Newfolder.exe)
>
[quoted text clipped - 10 lines]
>
> Shakeel Ahmad