Capque

So whenever I try to download the Windows Installer for Forge 1.7.10, it tells me "Do you want to make changes to your computer", I click yes... and then it doesn't install. I look in my Minecraft Versions folder and it isn't there, and when I try to add a new instance in my launcher, I can't because it's not there. I try a few more times and it just doesn't work. I really hope someone can help me with this considering I mostly play modded Minecraft.