bro, we first have to understnad waht he wants to do with a format.
if he wants to clear some space from drive then all he needs to do is select file and delete - ofcourse you still need to delete from recycle bin. if not then just hit shift+delete.
if he wants to remove bubble gum from his hair caused by a virus then a simple delete won't work as the registry and most files would be corrupted, too corrupt to work.
but from your post it seems he's suffering from low storage space. Ever thought of getting another HDD with a high capacity or maybe making partitions bigger/smaller according to needs ?
please post back with the answers - we can move from there