In the past, there was a "Facebook Messenger" desktop client for older versions of Windows, but that has since been deprecated. To access Facebook on Windows 7 today, you have to use a web browser or a "workaround" that mimics an app experience. Method 1: The Best Browser Experience (Recommended)
Some developers have created "wrappers"—small programs that essentially put the Facebook website inside a dedicated window. While these aren't official, they can provide a more "app-like" feel. facebook for windows 7
Windows 7 machines are often older, and the modern Facebook website is very "heavy" (it uses a lot of RAM). If your computer feels sluggish while browsing, try these steps: In the past, there was a "Facebook Messenger"