How to delete virus "autorun.bat"

How to detect virus in your pen drive are PC , First open the command prompt start-->run --> type cmd-->which drive to detect the virus identify it like example G:\> --> type attrib... command prompt virtual all file system and directory, In the drive search any autorun.bat

dos attack if any file system in drive type G:\>attrib -s -h -r autorun.bat and delete that virus G:\> del autorun.bat