Remember this is NOT a new issue. So my 2 minds are.
1. DO NOTHING!!!
2. Start over.
http://www.sevenforums.com/general-discussion/213806-disk-manager-show-two-entries-per-partition-2.html and a billion other posts do not get you a clean fix without starting over. There are many theories about why this happens but I've seen machines run without error in this condition for years.
under disk management its showing two C drives one with
Healthy (OEM Partition)
Healthy (Boot, Page File, Crash Dump, OEM Partition)
recently upgraded from windows 8.1 to windows 10.
upon right click it only showing help.