How can I force stop a program without using the mouse in Windows 10?

You can use the command prompt to terminate processes:

1. Open the Run box using Windows+R.
2. Type cmd in the Run box and click Enter.
3. Use the command tasklist to list all processes.
4. Use the command taskkill /F /IM "executable name.exe" /T to terminate the process.

Try the following:

1. Open the Task Manager by pressing Ctrl+Shift+Esc
2. Navigate using the arrow keys (↓ and ↑) to highlight the problematic process
3. Press the Delete key to kill the process
4. If necessary, acknowledge the subsequent prompt by selecting the appropriate choice with the arrow keys (← or →) and press Enter

A slight modification of the Taskkill answer: You can use wildcard if you don't remember/know the exact full name of the process, like so:

taskkill /f /im badproce*

It will kill all executables starting with that name, so make sure you don't just type something like s* because that could obviously kill critical processes like svchost.

Also, the /T flag is for killing the tree of processes, which is the target process and all the child processes it spawned. It may not be necessary most of the time.