Even if you did delete your boot records in this repartitioning process, you should be able to recreate the boot files using the tools supplied on your installation media. You will need to boot to your installation media, select Troubleshoot, and then Advanced Options; this should bring you to a page from which you can launch the Command Prompt, from which the tools can be launched.
The tool you are looking for is Bootrec.exe, which will create new boot files and search your system for Windows installations to add to the Boot Configuration Database (BCD). Since it appears your system has had its boot files removed, the simplest option would be to run bootrec.exe /rebuildbcd. Instructions on using /rebuildbcd and the other functions of Bootrec.exe which may be necessary if the BCD is corrupted rather than deleted, or other issues are found, can be found
here at Microsoft Support.
Further modification to the BCD and boot files can be performed using
BCDEdit and
BCDBoot, which facilitate manual editing of the boot files. Further information on these tools and information on how Windows 8 is installed on a system can be found on the
Deliver and Deploy page on the Springboard Site on TechNet