Try this 1
1) When you switch ON your computer, start tapping the "F8" key to get
"Windows Advanced Options Menu" 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 this time select the option
"Safe Mode". Let me know if you are able to boot into "Safe Mode" or "Safe Mode
with Command Prompt".