Desktop Completely Changed And Nothing Works?

I was recently browsing the internet (on windows 10) when suddenly it crashes then restarts. Instead of restarting fully it did a disk analysis. It restarted a few times when doing this scan but eventually it finished. When restarting it brought up a completely new desktop picture and had no password. This was completely different to mine. When going onto the desktop there was no taskbar, no recycling bin, but only 4 small white buttons in the bottom right corner. These buttons consist of language, wireless connection, ease of access? and power. None of these buttons seem to do much if nothing. In ease of accses there is a tab saying on screen keyboard and when clicked nothing happens. You cannot right click on the desktop either!