To set a dark background in Windows 7, you can try the following methods: ^{makeuseof.com 1 2}

1. Enable the “Show Desktop Background Image” option.
2. Configure display settings via the Ease of Access Center.
3. Set the desktop background using a different method.
4. Configure the desktop background settings.
5. Configure the high contrast settings.
6. Configure the power options settings.
7. Fix the display drivers.
8. Use the System Restore Tool.

You can also explore third-party theme tools or browser-exclusive themes for a dark mode. ^{fonedog.com 2}