MiniMinhMo :
USAFRet :
1. The System Reserved should NOT have a drive letter.
2. 7, 8, and 10 all use the System Reserved partition.
3. How did you install? Wipe everything associated with the old OS? Or.....?
Bottom line - I wouldn't try to delete it. You might screw it up completely.
I ran the setup.exe and chose the full clean wipe option.
From my above, #1 & 2 still apply.
Win 10 still needs that system reserved.
Go into your Disk Management, and see if there are 2 System Reserved Partitions.
Also, what happens when you boot? Does it ask which OS (7 or 10)? If not...leave it.