i am getting the following info whenever i try to execute any DOS based .exe or any batch file.

////////////////////////////////////////////////////////////////////////////////////
16 bit MS-DOS Subsystem | X |
////////////////////////////////////////////////////////////////////////////////////
<path of the file which i clicked>
C:\WINDOWS\SYSTEM32\AUTOEXEC.NT. The system is not suitable for running MS-DOS and Microsoft Windows applications.
Choose 'Close' to terminate the application.
_________ __________
| Close | | Ignore |
////////////////////////////////////////////////////////////////////////////////////

the files which i remembered to be executed earlier are also creation this prob.
i tried pushing the close, ignore, X, but the file wont execute.
i've win xp , sp2, with all updates, p4 , 256 ram, 40 gb hdd, etc.
please help.