This fall marks the 40th birthday of the Internet, and to celebrate it, Symantec, the manufacturer of online Security software, has put out a list of the "Top Web Threats in the History of the Internet."

Symantec has an interest, of course, in bringing you this treat. The company hopes the memory of worms gone by will entice you to buy its software to protect yourself.

But it's still an interesting list, and you may enjoy arguing with it, suggesting additions, even remembering times past -- unless, of course, your computer was hit by one of these worms or viruses.

So here goes. The descriptions are Symantec's.

1. I Love You （2000） -- Who wouldn't open an e-mail with "I Love You" in the subject line? Well, that was the problem. By May 2000, 50 million infections of this worm had been reported. The Pentagon, the CIA, and the British Parliament all had to shut down their e-mail systems in order to purge the threat.

2. Conficker （2009） -- The Conficker worm has created a secure, worldwide infrastructure for cybercrime. The worm allows its creators to remotely install software on infected machines. What will that software do? We don't know. Most likely the worm will be used to create a botnet that will be rented out to criminals who want to send SPAM, steal IDs and direct users to online scams and phishing sites.

3. Melissa （1999） -- Melissa was an exotic dancer, and David L. Smith was obsessed with her and also with writing viruses. The virus he named after Melissa and released to the world on March 26, 1999, kicked off a period of high-profile threats that rocked the Internet between 1999 and 2005.

4. Slammer （2003） -- This fast-moving worm managed to temporarily bring much of the Internet to its knees in January 2003. The threat was so aggressive that it was mistaken by some countries to be an organized attack against them.

5. Nimda （2001） -- A mass-mailing worm that uses multiple methods to spread itself, within 22 minutes, Nimda became the Internet's most widespread worm. The name of the virus came from the reversed spelling of "admin."

今年秋天标志因特网的 40 岁生日，为了庆祝它，赛门铁克这家网络安全软件的制造商发布了一个"在因特网历史中的顶级网络威胁"栏目。

赛门铁克公司当然有兴趣把这种款待带给你。这个公司希望网络蠕虫走过的记忆会吸引你购买它的软件来保护自己。

但是，它仍然是一个有趣的清单，你可能乐意和它争议，提出建议补充，甚至记住过去的时代--当然，除非你的电脑受到过一个这样的蠕虫或病毒的攻击。

所以开始吧。下面是赛门铁克公司的叙述。

1. 我爱你病毒（2000年）--谁不想打开一封在主题行里带有"我爱你"的电子邮件呢？ 好了，这就是问题所在。2000 年 5 月前，报告有 5 千万例感染这个蠕虫。为了清除这个威胁，五角大楼、中央情报局和英国议会都必须关闭他们的电子邮件系统。

2. 愚人节病毒（2009年）--愚人节病毒蠕虫已经创造出一套安心地用于网络犯罪的全球基础结构。这个蠕虫让它的创造者可以在受感染的机器上远程安装软件。这个软件做什么呢？ 我们不知道。最有可能地是可以用这个蠕虫来创建一个僵尸网络，将它租给想要送出垃圾邮件、偷窃证件的犯罪人员，进行网上诈骗的直接用户，以及网络钓鱼网站。

3. 梅利莎病毒（1999年）--梅丽莎是一位脱衣舞女，大卫？L·史密斯迷恋她并且也写作病毒。他以梅丽莎命名这个病毒并且在 1999 年 3 月 26 日向世界公布，开始了一段引人注目的威胁，在 1999 年至 2005 年间震撼了互联网。

4. 速客一号病毒（2003年）--2003 年 1 月，这个快速移动的蠕虫设法暂时地使大部份的网路向它屈服。威胁是那样的咄咄逼人，以致一些国家认为是对他们的一次有组织的攻击。

5.尼姆达病毒（2001年）--一一种集合的邮件蠕虫，采用多种方法来传播自己，在 22 分钟内，尼姆达成为互联网上最普遍的蠕虫。该病毒的名字来自于反拼写的"admin".