I decided to download a Blockland again to test an add-on I have been trying to make, It failed so I uninstalled. I had it on the desktop and it deleted every file except for Computer, Documents, and Recycle bin. I am never doing this again. I am posting this to warn anyone who does this. It will not screw up your computer but it will cause an inconvenience that you have to restart the computer and put all your Icons back on the desktop.