can i remove this very first initial password…..

i just turned on my pc (after getting it back off a guy who was supposed to give me some cash for it as he was going to buy 3 months ago), it started to load…. next second it asks for my current password (all of this took place in 10 to 15 seconds after i switched it on)…… i’ve tried 3 of my current passwords, it then displays

Password check failed
Fatal error – system halted ….

so I then turned it off, rebooted and it done the same ****…. is there a way to bypass this or remove it?