I have been able to combine a left-sided Un-allocated with a right-sided in-use partition, however, it involves a semi-torturous series of steps, things to do, using either Acronis Disk Director or something similar in power and ability. Very briefly put, it involves:
-- making restorable full image backups onto external media before attempting this surgery
-- making the Un-allocated an NTFS volume or partition [with the same NTFS allocation clump of its in-use right-side neighbor]
-- merging the formerly-Unallocated/now NTFS volume or partition with its right-side neighbor; absolutely making sure to specify which one of the two merging volumes/partitions will be the "master", "the boss", "THE volume"
-- restarting a few times, letting Windows and Desktop settle down
-- checking on existing folders and files to make sure everything safely made it through this process
I have no idea on how to walk you through this because I have no idea what experience and what utilities you have.
Edited by RolandJS, 01 September 2016 - 09:26 PM.