【1】制作PE启动盘,参考
http://jingyan.baidu.com/article/72ee561aadfb1fe16138dfab.html
【2】拿PE启动盘启动电脑,重置密码,参考
http://jingyan.baidu.com/article/3c48dd344a0e46e10be358a5.html?qq-pf-to=pcqq.c2c