Hello,
Are you able to boot into safe mode and perform a system restore?
Boot your computer in Safe Mode by doing the following :
* Restart your computer
* After hearing your computer beep once during startup, but before the Windows icon appears, tap the F8 key continually;
* Instead of Windows loading as normal, the Advanced Options Menu should appear;
* Select the option, to run Windows in Safe Mode, then press Enter.
* Choose your usual account.