Did it move those icons to the "Unused Desktop Icons" or whatever folder? Or maybe it moved it to this folder, and then you deleted the folder and it fucked something up?

I use Icon Restore (here at download.com). It gives me two extra menu items when I right-click my Recycle Bin or My Computer icons - one for Save Layout and one for Restore Layout.

You can change your desktop icon size on a Windows 10 computer in a few steps. The default icon size is usually medium, but you can adjust it.