When your Dell computer is stuck on a blue screen, you can try the following steps to fix it:
The first thing you must do is to turn off your computer. And during the bootup process, press F10.
You will be directed to the Windows recovery program page. Choose to perform a full recovery.
If you require technical assistance at any point of the recovery procedure, you can contact Dell Customer Support to consult with skilled technicians and to avail their help to fix the issue.