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I already had installed Windows 7 on D: partition. I installed Windows 8 Developer Preview on C: drive but I can't dual boot Windows 7 and Windows 8, it directly boots to Windows 8. My D: partition contains all Windows 7 files. How do I access Windows 7 again?

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Try this - press F8 while starting. And do try to research/say what you have tried, that was the first Google result I had. – Bob Feb 13 '12 at 8:00
Alternatively, try this (step three). – Bob Feb 13 '12 at 8:02
Or… – Moab Feb 13 '12 at 15:47

Download Visual BCD Editor. It comes with Dual-boot Repair tool.

First run Dual-boot Repair -> "Automatic Repair" - this will fix boot environment (if any errors).

Then run Visual BCD Editor. RightClick -> Select "Create missing Windows loaders" (this will add boot entry for Windows 7 and any other installed Windows system XP, Vista, Windows 8).

To set Windows 7 as default: click on Windows 7 in treeView - in Object tab - Set as default loader.

Reboot you should have a dual boot menu.

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