I got a question for all,can McAfee Virus scan block "cmd prompt" from executing it. Reason am asking, it is bcz after installation of McAfee Agent 4.8 and Virus Scan 8.8 p6 in user system(W-7 sp1 2gb ram 500gb memory dual core processor). Cmd doesn't open , it displays "CMD prompt has stopped working". IT person didn't find any solution and so he formated the system and after formating it ,system performance went low.what is the exact reason for this issue, am not able to identify it ? please help me!