the C hardware in my PC was just 30GB it is almost full the free space is less than 2 GB, I want to delete the Hardware E and add its space to hardware C..... I don't know how to do that.
If the E drive is contiguous behind the C partition, and if your os is Winodws 7, vista, or Windows Server 2008, the built-in disk management couold help you get your goal.
Go to the disk management,
When you delete the E drive, it will become a full unallocated space, then you could right-click "C partition" and select "extend volume" then follow the wizards to complete the operation.
If the "extend volume" greyed out, you could refer to this article to solve the problem: