I have Windows 7 ultimate, I installed Windows 8 Enterprise on the partition. The installation went well, I was able to boot into Windows 8. I changed the primary boot OS to Windows 7, when I restarted my PC, the dual boot has disappeared. Windows boots straight into windows 7. I used msconfig to check the boot options, I can still see both windows 7 and 8 in there with Win7 as the default OS.
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