I don't know which country you are from, there are plenty of H61 motherboard on ebay for £20
Ryzen 5 1600 is too old.
For your budget, you should be able to get Ryzen 5 2600 with B450 motheboard and 2 x 8GB DDR4
I am not sure if you need to buy new windows key. I used my old windows 7 OEM key...