You may be able to move your files just by changing their locations in Properties. Right-click the folder to move (Documents, Music, Photos, etc.), and then select Properties. In the Location field, change the entry to D:\\ [name of folder], and then click Apply and OK. Alternatively, open the folder you want to move, right-click an empty space, and go to Properties > Location > Target. Make the D drive the target, and your computer should move the folder over.