Hi,
Please do try these troubleshooting steps that may help.
- First is to do a hard reboot, remove the battery and unplug the AC adapter then press and hold the power button for 20 seconds then try booting it up again.
- If it would get stuck on the same loading screen, do try loading it in Safe Mode.
- While the laptop is booting up repeatedly press on F8 until it loads Advanced Boot Options, select Safe Mode then press Enter.
- If it will load in Safe Mode do run System Restore, put it back to an earlier date or time before the problem even happened.
- Here's how to run System Restore:
http/windows.microsoft.com/en-us/windows-8/restore-refresh-reset-pc
- If System Restore will still not work last option would be to reinstall Windows.