go to start - control panel, system and security, restore you PC

pick a date when you are sure that your PC was good.
No anti-virus will save you from all virus. System backup will solve all problems. I have done it a few times. You will not lose any saved files, you will only lose software that you installed after the backup point.

所有跟帖： 

• 真有這等好事？下次要試一下. 省了我兩月一次backup的麻煩. Thanks -imayazifan- ♀ (0 bytes) () 04/03/2015 postreply 19:20:34

• 你每個月backup一次，你讓人家微軟情以何堪啊~~？ -雪花無聲- ♀ (0 bytes) () 04/03/2015 postreply 19:42:43

• 我是職業病，有了backup萬事不愁, 哈哈 -imayazifan- ♀ (0 bytes) () 04/03/2015 postreply 20:08:54