The minimum requirements for running Windows 10 are:
Windows 7 SP1 or Windows 8.1
A 1GHz processor or faster
1 GB RAM for 32-bit or 2 GB RAM for 64-bit
16 GB hard drive space for 32-bit or 20 GB for 64-bit
DirectX 9 or later with WDDM 1.0 graphics card
Unfortunately MS tend to be a little optimistic in their predictions, to get Windows 10 running at anything above a snail's pace you'll need to have higher specifications than those.
Vista is long out of Micosoft's support window, so Windows 10 isn't a free upgrade.
If you don't have any reason to stick with Microsoft*why not try one of the versions of Linux (e.g. Linux Mint)? You download the ISO, and either burn this to a DVD or use a program such as Etcher to 'flash' it to a memory stick and start you computer using the DVD/USB to try it out (it won't affect your harddrive).
* Linux doesn't run Windows programs, but there are equivalent of many programs for both operating systems (e.g. Firefox web browser). However, there are some Windows programs that can be run on linux using a program called WINE, whilst there are (mostly free to use & open source) Linux programs that can do just about anything that a Windows program can do. and other Linux software equivalent to Windows software page
_________________ It's not fair to apply rational analysis to my utterances - Jacob Rees-Mogg in BBC Radio 4 interview
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