Depending on what version of windows the laptop is running.
When you first power the laptop on, and as soon as the laptop starts to load windows, repeatedly tap the F8 key on the keyboard of the laptop.
If you catch the windows loading menu in time.
Either select the option of last good known configuration.
Or choose safe mode for windows.
Once windows has loaded if selecting the last good known configuration option.
The system should load windows without sticking at the welcome screen of windows there after.
The same also applies to if you choose windows safe mode once windows has loaded in that selected mode.
If none of the options fix the loading and hanging of the laptop at the welcome screen of windows.
Use the same F8 key...