我的电脑行为异常，我怀疑是病毒。

My computer has been behaving oddly and I suspect it's a ___virus.

那个文件是个病毒，删除了我电脑上的所有文档。

That document was a ___virus and erased all my documents on my computer.

你应该安装杀毒软件来保护电脑免受病毒侵害。

You should install antivirus software to protect your computer from a ___virus.