A friend downloaded Classic Shell to my Win 8 to make it like Win 7 .It is much easier to use but i'm wondering if it can hurt it in any way ...
It looks safe to me, and comes form a legit web page as seen below.
Here is a link that might be useful: classicshell
I use classic shell on my Windows 7 to make it more like XP in appearance. Been using it a long time.