Hello,
It discussed here about Windows Boot Manager - Error 0xc000000f
Please mind to check.
http://answers.microsoft.com/en-us/windows/forum/windows_vista-update/windows-boot-manager-error-0xc000000f/7398cba5-99dc-4a49-a3a8-6500b2bba6f3
Hope this will help you.
Have a blissful day!
I have a Hp g62 windows 7 64 bit laptop that recently when I turn on I get the following message: status: 0xc000000f. info: the boot selection failed because a required device is inaccessible. I have made a USB windows 7 repair disk but the problem with that is it never loads past the language input screen even after hours, but has worked a couple times to where I could use the command prompt. When I use the command prompt to fix the MBR it did not work. Has anyone experienced this and if so how to fix it?

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