Once installed - all desktop shortcuts gone - have a clean slate

I tried to install windows 10 - it seemed to work but then all my desktop shortcuts were gone and I couldn't access anything - unless I searched one by one each file....what have I done wrong and why is everything gone ?? I need all my information and couldn't access so I went back to Windows 7

We can't tell you what went wrong until we know exactly how you installed Windows 10.

Try to click on the empty desktop and then create a file on here , all those will be appear on desktop.