You can't delete it. You have to reinstall the windows. May be the virus scan works but I strongly recommend that you reinstall your window and install a good anti virus on the computer.
How Do I Remove Dr Watson From My Computer?
Hello, I'm afraid you can't just remove it from your system. It's a component of windows used to detect errors. If you have issues regarding it, read this article to repair dr watson.
Denison: Just as if your medical Dr. Tells you that you have a disease DON'T BLAME THE DOCTOR. Dr. Watson is the system that Windows uses to notify you that some other system failed - he's not the source of your trouble. Plan on reinstalling Windows and adding good quality anti-virus to your system before you go surfing again.