Format a virus by using a dos prompt

Hi friends we are going to see how to Format a virus by using a dos prompt
we can format hard disk , but cannot format virus.
we can delete virus, but cannot delete hard disk.
to Format Hardisk in DOS,
in command prompt,
type:
format c: /q
and press enter
c: mean C drive. if you want to format other drive, such D, type D:
/q mean quick format.
To delete virus in hard disk in DOS,
1. you must locate where the virus files is. most of the time it will reside in c:\windows and c:\windows\system32
2. if the virus files are at C:\windows
then:
in command prompt:
type:
cd\windows and press enter
del /F /AS virus.exe and press enter
virus.exe is an example of a virus file.