OK, you deleted Windows.old.

Regarding your drive letters, you can change them if you right click on disk in disk management. Select letter taht you would like to use (ie. G: ) and it will stay.

Regarding on screen keyboard, there are two possibilities: real on screen keyboard and possible keyboard for touch screen devices - tablets.

This answer on microsoft forums covers both of it.

Edit: and you will have to make D: drive larger if you want all your libraries on it. You have spare partition and one of your reserved partition is quite large.