I've yet to find that out of the box that such folders would be on the internet. Something is horribly wrong here. I've only setup a few hundred 8/8.1 PCs so I can't guess what is different on your setup.

As to what's hacked your machine I can't guess given the details but something is very bizarre about your setup or it's just infected.

Why not reset to the factory condition and before you install ANYTHING, read this:
http://www.howtogeek.com/201354/ninite-is-the-only-safe-place-to-get-windows-freeware/

I can't guess what you installed but so much is infected or infested.
Bob