Fixing Registry program issue is easy, here are ways to help you.
1.Right click on the Desktop, then select Personalize.
2.After you enter, you'll see Change desktop icons, Change mouse pointers and Change your account picture on the left column. They are normal desktop change items.You can enter into them and change according to your need.
1.Type regedit in start menu searchbox and press Enter. It'll open Registry Editor.
2.The Registry Editor has two panes. The left pane is to navigate on certain registry keys and the right pane is to see values of keys that you select.
3.Then in the left pane select you want and in the left pane right click to edit it.
4. You can also double-click on the value with your left mouse button. Another option is to use the "Edit" menu, where you can edit chosen value in the window and click the "OK" button. You can do the same with any other value or registry key.