如果你是新的计算，你可能会想，如果你有防病毒软件真的是必要的，如果你保持你的系统更新。仅仅更新就足以保证系统的安全吗？今天的超级用户问答帖子讨论了这种情况，以帮助新的计算机用户做出正确的决定。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

问题

超级用户读者John Sonderson想知道保持Windows 7的更新是否足以保持安全，或者他是否还应该安装杀毒软件：

I was thinking, given that I keep Windows 7 regularly updated through Windows Update, does this make having anti-virus software installed a useless gesture? I may well be a naive user, but it seems to me that if security concerns are found, then any patches to the operating system to close those security holes should solve the problem.

So, if my Windows 7 system is up to date via Windows Update, and I do not use an administrator account (but a restricted account instead), do I still need anti-virus software?

通过WindowsUpdate更新Windows7系统是否足以保证系统的安全，还是应该安装杀毒软件？

答案

超级用户贡献者Scott Chamberlain和Frank Thomas为我们提供了答案。首先，斯科特张伯伦：

Updates to Windows will not protect you from software that you yourself have run. If you are tricked into running a malicious program, it can unleash its payload.

You also state, “…if I keep myself logged in as a regular user without administrative privileges” but get a UAC prompt from a program and type in the administrator credentials, it does not matter that you are a regular user.

Windows Update does not protect you from bugs in other software like your web browser (unless you are using Internet Explorer), so a virus could get in that way (which anti-virus software would have blocked).

Lastly, even if the program never gets administrative privileges and does not use any exploits in Windows, there are still plenty of bad things it can do within the bounds of a restricted user account. A non-elevated program can read almost all the files on your hard-drive and send that information anywhere it wants. If you have any valuable information on your hard-drive, the malware author now has a copy of that information as well.

接着是弗兰克·托马斯的回答：

No. Windows Update often patches vulnerabilities used by worms and viruses, but rarely affects a trojan’s ability to mess you over. Additionally, lots of bad software can affect you and your user profile without administrative privileges. Back in 2010, we were removing fake anti-virus apps from systems where no admin had ever logged in.

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