I am getting NTVDM CPU ERROR MESSAGE on my screen. I am getting this error when I am trying to run cmd or regedit. I cannot open any of them. The complete error message description is "The NTVDM CPU has encountered an illegal instruction C5:0557 IP:fff2 OP:fe ff 1d 0902 Choose 'close to terminate the application". When I click on ignore nothing happens. There were lots of virus on my pc. Due to which I think this error generated. Can anyone provide me more information on this problem and the way to troubleshoot it.