Unless the person wiped clean the laptop, you probably have personal identification on the laptop (is the windows user account your name, for example?).
If you bought the computer from a 1st party, or installed from scratch, how about:
- Open your "Computer" folder (Start menu -> Computer)
- Display the file menu (hit ALT to show it)
- Select 'About Windows'
- See who the machine was licensed to.
This is the name that was entered on the first time the laptop was started up. It's not the user or account name, and it's not the computer name, it's the Windows licensee name. For me, I put in my last name. I think the setup prompt says, "Who is this version of Microsoft Windows licensed to?" or something like that.
Unless the operating system was reinstalled (or unless it was pretended to be reinstalled using certain command-line tools meant for OEMs), this name would never change, even if your original windows user was deleted and a new one created.