|Hello, this could be caused by a virus, or something like that.|
You should try to start in Safe Mode, and see if it happens.
If not, wile in SM, run your antivirus, It should work great.
Keep us informed.
You can see the event viewer, for more information about the errors.
And you can desable all the startup programs and services in msconfig.
Start -> Run -> msconfig -> OK
Desable all services and all startup programs.
Reboot in normal mode, see if the issue persists.