How do I get into my pass-protected laptop that has external issues?

So, here’s the deal. When I was nine I received a Dell Inspiron 1545, and it worked wonderfully. Now I’m eighteen and I want to get into it again because I need a VM. So today I tried to get back into it and I don’t know the password at all. I can’t access anything through it and I’ve tried out every tutorial on the internet that covers it. I also just finished CS50 with Harvard to get my technology certification, and if I can’t figure it out, I feel like nobody can. I’m frustrated, hopeless, and ready to rip my head off.

Here’s a YouTube video that I made for further detail.
Untitled - YouTube

Thank you so much!

(p.s.
I came here because the asses at CNET locked my thread because I made my account THAT DAY and then added ONE VIDEO LINK, after stating that I had a real problem, of course. I wish not to be treated this way and to rather have my problem fixed. Thank you!)

Hi! :)
As a rule, six in here says "6) No discussions of hacking someones system, network, password, etc."
You probably don't going to get so many suggestions.
But have you tried to test your old passwords that you can imagine you used at that time?
I had a 486 sx25 who had been untouched for 15-20 years. It took me a week to guess what I had for password at that time. which turned out to be name of a cat we had at that time.
Try that method first.
//Marie