Can’t for the life of me get into my Windows Vista computer?

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.

Thank you so much!

(p.s.
I came here because the a$$es 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!)
 
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