Problem accessing my files. Reason: Lost Password!!

I have a very important file in my laptop that I need to access. But the problem is, I forgot my administrator's password. I tried to login using my other username that has only limited access. Still. I failed to login even after I restart my computer and run it in safe mode. It is useless because I don't have an administrator account that I can use to login.
My folder is in-accessible in any way. I'm really running out of options here.
Can anyone help me on this.
