Yeah, just find your product key and put on windows again, don't start on safe mode or get a better anti-virus software!
Plus this is what it says in windows help and support:
If your computer automatically starts in safe mode without prompting, a problem with your computer might be preventing Windows from starting normally. If you think the cause of the problem might be a recently installed program or device, try using Recovery in Control Panel. For more information, see What is Recovery in Control Panel?