How do I get into a password locked computer?

I just inherited an old computer from my greatgrandfather and I need to get onto it but dont know the password. I cannot log in as a guest and I cannot figure out how to get it into safe mode. In the start up f8 and f10 dont do anything. I can press delete to get to the setup menu but I cannot find safe mode there.... show more I just inherited an old computer from my greatgrandfather and I need to get onto it but dont know the password. I cannot log in as a guest and I cannot figure out how to get it into safe mode. In the start up f8 and f10 dont do anything. I can press delete to get to the setup menu but I cannot find safe mode there. So I cannot figure out how to get into MSDOS not that I would know what to do from there anyway. I DO have gramp's windows xp os disc and product key though.
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