Try this 1
1) When you switch ON your computer, start tapping the "F8" key to get
"Windows Advanced Options"( if boot menu appears, press "Esc" key and
keep tapping the F8 key)
2) Select the option "Last Known Good Configuration".
If the problem still exists then follow the step 1 and select the option "Safe Mode"
Let me know if you are able to boot into Safe Mode.