How do I delete the free space to make it unallocated space

I know that the above thread title has already been addressed in the past but none of them have solved my problem till now. I have already read following threads- http://www.sevenforums.com/hardware-devices/109301-can-t-delete-free-space-partition.html http://www.sevenforums.com/general-discussion/183502-can-t-delete-free-space-disk-management.html...