what to do if dialogue box appears 'C:\WINDOWS\system32\rundll.exe'

Ashish 27

Commendable
Apr 28, 2016
1
0
1,510
Whenever I m opening somethimg , this dialogue box appears - '16 bit ms-dos subsystem
C\windows\system32\rundll.exe
The NTVDM CPU has encountered an illigal instruction.
Chose close to terminate the application' so now what should I do guys????!!!