阅读理解

　　Last night when I was working on my computer, my article suddenly disappeared! Annoyed by the sudden disturbance, I turned to Mr Lee for help, for he knows much about computers．He strongly suggested that I should download some virus-killing(杀毒的)tools to sweep away the virus．Especially, he recommended the Rav software．“It's effective,” he said．

　　I adopted(采纳)his suggestion and went for it．An hour later, I got my computer restarted and the Rav bagan to scan．Ten minutes had passed before a result came out．“None．” It said．I was confused! Was it true? No virus at all? But my computer couldn't get to work yet．

　　I told this to Mr Lee．He laughed and said, “Why haven't you updated(更新)it? Do it first and then thousands of virus will be found．” I followed his instructions．But yet nothing happened this time．Why didn't my effort come off? What happened to my poor computer? What's the matter on earth? I began to regret(后悔)spending a whole night working on that stupid stuff．

　　Tired and frustrated, I went to bed．In my dream, I continue my fighting against virus…