What are the sizes of the main partitions C & D?
If you don't have the right partitioning tools, it will take some doing, & the availability of another drive to temporarily store backups.
If the main system C: partition is large enough for Win7, I'd suggest leaving the partitions as they are.
The 9Mb unallocated space may be there for a reason, & is too small to make any difference in enlarging the other partitions. G