How can I delete a disk made by shrinking another disk

I made a disk shrinking another disk or volume (Software ()). After shrinking I changed the drive letter of disk Software from D to K and the newly formed disk (the shrinked one) into Local Disk D. The newly formed disk was shown in Disk segment when I go to Disk Management but not in Volume segment. Besides, the newly formed disk has no drive letter. I can't fromat the certain drive or delete the volume.

When I prompt to delete or format, there shows a message:
"An unexpected error has occurred. Check the System Event Log for more info on the error. Close the Disk Management console, then restart Disk Management or restart computet."

Can I regain my space? Please help.

According to your picture you have only one HDD/Hard Disk Drive with several Partitions on it but the picture is incomplete, shows a hint of at least one more partition and that does create a difficulty in suggesting the best thing to do. I'd right-click that partition Free Space and if it's an unformatted partition delete it or if it's unallocated space merge it with another partition, Extend it. You may gotten into a situation where a partition manager software [bootable CD such as the free GPARTED] would work better than the built-in functions of Disk Management. Just be sure to back up/copy any data you created or that exists nowhere else to a different drive such as an External USB HDD first.

Note: you can't have more than 4 Primary Partitions on an HDD, more would require creating an Extended Partition with Logical Partitions in it.
http://en.wikipedia.org/wiki/Disk_partitioning