Additional information and workaround for Snipping Tool freezes

Alt+Tab still worked though. There is a small X that appears if you hover an application thumbnail with the mouse. Using this you can close Snipping Tool.

If the Snipping Tool occasionally fails, restart the app and try again.

Try to fix Snipping Tool with "sfc /scannow" command.

Open Run prompt using Win + R and then press shift+ enter after typing "cmd". Once the command prompt opens with admin privileges

Type "sfc /scannow" in the command line, press "Enter";

Relaunch the tool by typing "snippingtool.exe" on the command prompt. Then try taking a screenshot, and see if the issue persists

If the Snipping Tool frequently fails, reinstall the app or use a different screenshot tool.

To use your keyboard shortcuts to take a screenshot, on your keyboard, press Prtsc to take a screenshot of the full screen or press Alt+Prtsc to take a screenshot of the current window, then paste it to the desired location.

Third-party apps such as QQ and WeChat also provide screenshot tools. Open a QQ chat window and click the "scissors" icon to take a screenshot, then paste it to the desired location.