I surely wouldn't spend ANY money on a computer of the age of one running Vista. To do what you proposed would probably be more than the price of a brand new machine running Win 7 or 8.1.
I admit I'm a power user, but I can't even imagine still running a computer of the vintage of Vista which was released in 2007. As I recall computers in those days probably had 1-2GB of RAM and hard drives of 100-250GB and the processors were probably single core Pentium 4's at best. By comparison I just looked at Costco.com and they have a Dell with a dual core Pentium, 4GB of RAM and a 500GB hard drive and 64-bit Windows 8.1 for ~$280. That will almost assuredly outperform what you have and will qualify for the free upgrade to Windows 10.