这电脑有没有安装防毒软件？

Zhè diànnǎo yǒu méiyǒu ānzhuāng fángdú ruǎnjiàn?

Does this computer have anti virus software installed?

他们安装了新的电视机。

Tāmen ānzhuāngle xīn de diànshìjī.

They installed a new television.

他们安装了防盗系统。

Tāmen ānzhuāngle fángdào xìtǒng.

They installed a security system.