To install apps on your Windows 7 computer, you can either download and install the app from the internet, or install it from a CD or other physical installation media such as a USB drive. To download and install an app from the internet, simply go to the website of the app's developer, locate the download link for the app, download the installation file, and then run the file to begin the installation process. If you have an installation CD or other physical media, simply insert it into your computer's CD/DVD drive or USB port and follow the on-screen instructions to install the app. In some cases, you may need to enable the installation of apps from unknown sources in your computer's settings before you can install an app from the internet. Additionally, make sure you have the latest updates installed for your Windows 7 operating system, as some apps may require specific updates or patches to be installed in order to function properly.