|"want to delete usb entry from regedit using dos cmd"|
Regedit is a command/tool used to edit the registry, that's why is called REGEDIT. You do not have to use CMD. All you do is go to Start > Run, type in regedit, then click OK. I assume you want to remove the USB entry because you don't want anyone to know you've been using your Kingston DataTraveler on the system? Click Edit > Find, type in your search term, then click Find Next. Delete the entry, then press F3 to find the next Entry, delete that, then continue the process until no more are found.