So long as you have a built-in modem, you can use Windows Fax and Scan to send and receive faxes from your computer. Learn how to use this classic program along with alternative faxing methods.
On Windows 10, you can use the DISM command tool to repair the local image, which you can use with the System File Checker ...
Nmap is a free network scanning software available for Windows, Linux, macOS, etc. This open-source freeware can be used to check ping status, scan the entire network, check the uptime of any host, ...