The troubleshooting steps taken when an application freezes are as follows:
Forcefully End the Application
On a PC / Laptop keyboard, press (and hold) Ctrl+Alt+Delete (the Control, Alt, and Delete keys). This will open the Windows Task Manager . Open the Applications tab on this screen. You will see a list of applications. The applications should have the status as Running. An application which is not responding would have the status as
Not Responding. Select the application which is not responding from the list and click the End button. This forcefully terminates the application. Now restart the application.
Restart the Computer
If you are unable to forcefully end an application, close all running programs and restart the computer.
If you are unable to shutdown/ restart your system, perform a hard reboot by pressing the Power button, i.e. manually turn off the computer. This step should be performed in extreme situations, as a last resort. Remember that hard reboot may cause data loss.
Once the system is responding, run the virus check to scan the system for viruses.