Hi and thanks for reaching out. My name is William. I'm a Windows technical expert. I'll be happy to help you out today.
Create a Windows 10 boot media using this MS guide: https://www.microsoft.com/en-us/software-downlo...
Afterwards, boot from the USB media. At the Windows install setup select the Repair option > System Recovery Options > Command prompt. From here you can use Diskpart to try to recover the system reserved partition. I believe the appropriate commands would be:
diskpart
list partition and note the drive letter for your system disk (it may not be C:)
Select x where x is the Windows system drive
active to make the drive active.
Or refer to this iink for more for additional steps:
http://woshub.com/fix-cant-boot-after-accidenta...
Alternatively, you can use the same tool you used to bork the system reserved partition (if you have the proversion): https://www.partitionwizard.com/disk-recovery/h...