Windows 8 will no longer dual boot.

I have a laptop with Windows 7 64bit Enterprise on one partition, and Windows 8 64bit Enterprise on the other. I installed 7 first, then 8. For a while the system prompted for Windows 7 or Windows 8 at boot up. Recently Windows 8 had some

problems and wanted to repair itself by reinstalling. I inserted the system disk and told it to go ahead. It had whiped out the software that I had installed (Office 2013 and Visual Studio 2012), which was fine, becuase this was a fresh build

with no data. After it repaired itself, it was no longer prompting for the dual boot, it was going straight to Windows 8. The Windows 7 partition is still there. It is called SYSTEM and does not have a drive letter assigned. How can

I repair this using Windows utilities only? I do not want to download non-Microsoft utilities.

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