can't open 'cmd' ++

[tawxic]

okay, start -> run -> cmd:

opens the console box, black bg, with nothing writting in it, and gives me this error:

|[u]16 Bit MS-DOS Subsystem[/u]__________________|
|C:\WINDOWS\system32\cmd.com
|The NTVDM CPU has encountered an illegal instruction.
|CS:055c IP: 0102 OP:ff ff 83 3e 51 Choose 'Close' to teminate the application
|                        [ Close ]   [ Ignore ]
|_____...|

Ignore and close both close it.

Then, when I open 'command':

I can "dir" and "ipconfig" but I cannot 'ping', it gives me an identical error to the one above.

Any ideas?

Edited August 20, 2005 by tawxic

[army20]

My guess is that a virus may have replaced your system32\cmd.exe because the original one do not use NTVDM (New Technologie Virtual Dos Machine)

Edited August 21, 2005 by army20

[army20]

You may also check this Knowledge base : http://support.microsoft.com/kb/q196453/ it is for windows 2000 but you may find information about your problem

[what3v3r]

try start-run-"sfc /SCANNOW"

you will need your windows XP cd

sfc scans all your system files and replaces them with the original if it has been altered