check your [悄悄話]為什麽一卸載瑞星就死機！？可是到最後還是卸載不了。

a system without good antivirus software is likely dangerous. you may need backup your data and files, reinstall your operating system.
sugestion:

create 2 or more regions in your Hard driver, to C, D, and/or E; install OS in C, left D, E, for Data.