A user reports that an application crashed. The technician tries a few other applications on the PC and finds that none of them start normally or that they crash soon after being launched. What is a possible cause of the problem?

The possible cause of the problem on application keep on crashing in user's PC lies on the computer's operating system.

The computer's operating system performs automatic updates (sometimes being set into manual updates). Either way, updates can cause applications to crash if it is being installed wrongly. Sometimes due to slow internet connection, updates get paused and will cause problems in your computer. You can apply the following steps to fix applications that keep on crashing:

Make sure the operating system updates are installed correctly. You can take a look at your system configuration, (in Windows 10, you can see it at system settings > Windows Update Settings), there are updates list that you can see and you can choose either you will stop, reinstall and continue the updates. You need to execute a clean boot. You will need a third party tool to try this method. You need to back up your data and perform system restore to the last OS version installed in your computer that functions well. You can select this method if you want to undo the system update and would just like to use your computer in it's last best state.