New
#1920
I'm really sorry, but the PC with Vista on it doesn't qualify for the free upgrade.
There are two ways you can upgrade: (1) Find a less expensive copy of Windows 7 or 8.1 and upgrade to that, and then upgrade free to Windows 10 or (2) buy a copy of Windows 10 and use it to upgrade to Windows 10.
If you choose either route, be very cautious, especially when buying Windows 7 or 8.1. Buy from a reputable vendor such as NewEgg or Amazon.
Edit: A savings of a few dollars isn't worth it if you get stung with a non-genuine copy of any version of Windows 10.