OK, I think I got it figured out, I will post it here as given recent events others may be doing this for the first time in many years.
>right click on the windows icon and choose "Windows PowerShell" from the drop
>at that prompt
Get-FileHash path to your file (eg;C:\Downloads\armory_0.96.5_win64.exe) -A SHA256
and press enter, this will return a long hex string
>compare this string to the one for your specific download in the file at
https://github.com/goatpig/BitcoinArmory/releases/download/v0.96.5/sha256sum.txt.asc it does not appear to be case sensitive, the power shell returns all caps, the string should match but the one in the signed file is lowercase letters.
>you can automate the comparison with a little more code
(Get-FileHash path to your file (eg;C:\Downloads\armory_0.96.5_win64.exe) -A SHA256).hash -eq "paste the hash here"
note that there do not seem to be context menus in the power shell, I was able to paste the string with Ctrl V however. This should return "True" which in my case it did.
I think that's it, really simple.
If anyone has anything to add please do.