well of course, windows 98 is the best system to crash. pretty much do anything and it will crash
. But with XP...hmmmm....you can launch every program you can imagine...launch a couple of games, flash, dreamweaver, kazza (dowload like 20 movies) uhhh have word, music, intrenet all going, as well as a messanger. Then go task manager and blow urself off
of course you can also go on a hacking forum or a hacking channel on IRC and tell em ur IP and they'll have it done in about a minute.