If it doesn't fail in safe mode then something that is being started when you boot is causing the problem. Run the Windows Task Manager (start / Windows System / Task Manager or CRTL-ALT-DEL then select Task Manager), click on the Startup tab then look for things that you don't know what they do.
You could also disable some, reboot, then see of the problem is still there. If so, reenable the ones you stopped and disable some others. If not, reenable one by one until the problem comes back.
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