Hi, everytime i go to start->Run and type cmd or regedit i get the error message: "cmd is not a valid win32 application". I have ALREADY scan my PC with Mcafee,online virus scanners (e.g Panda),download removal tools...but nothing AT ALL. but when i write cmd.exe the window open!! Can anybody knows whats that ? thanks. i am running WInXP with SP2.