A:This computer froze again! Can you come to(看一看)my PC? It's acting up again. It must have a virus or something. B:Just (给我点时间),I'll be right up. B:I ran a virus scan on your computer, and it turns out that you have a lot of (被感染的文件)! A:But I'm quite careful when I'm browsing the internet.I(不知道) how I could have picked up a virus. B:Well,you have to(确保)that your anti-virus software is updated regularly, yours wasn't up to date,that's probably what was causing your problems. A:Ok.Anything else? B:Yeah,try not to kick or hit the computer! A:Um yeah.Sorry about that.