Hi,
Let the notebook start in Safe Mode. Then hold down the Windows key and press R. Into the Run Box type msconfig and hit enter. In the System Configuration window, click the Boot tab and look to see if there is a tick in the box next to Safe boot - if there is, click the box to remove the tick and then click Apply to save the change. Restart the notebook and see if it will boot normally.
Regards,
DP-K