Can you open an administrative command prompt and type bcdedit ? This should list the BCD store that might have some clues as to what might be happening. The translations on the pictures are a help.
Have you run any other OSes or do you have additional drives that might have had an OS on them?
Windows Boot Manager
--------------------
identifier {9dea862c-5cdd-4e70-acc1-f32b344d4795}
device partition=C:
description Windows Boot Manager
locale da-DK
inherit {7ea2e1ac-2e61-4728-aaa3-896d9d0a9f0e}
default {33565aab-7970-11e0-8e06-b2af3433d0a2}
resumeobject {33565aaa-7970-11e0-8e06-b2af3433d0a2}
displayorder {33565aab-7970-11e0-8e06-b2af3433d0a2}
toolsdisplayorder {b2721d73-1db4-4c62-bf78-c548a880142d}
timeout 30
displaybootmenu No
Windows Boot Loader
-------------------
identifier {33565aab-7970-11e0-8e06-b2af3433d0a2}
device partition=C:
path \Windows\system32\winload.exe
description Windows 7
locale da-DK
inherit {6efb52bf-1766-41db-a6b3-0ee5eff72bd7}
recoverysequence {33565aac-7970-11e0-8e06-b2af3433d0a2}
recoveryenabled Yes
osdevice partition=C:
systemroot \Windows
resumeobject {33565aaa-7970-11e0-8e06-b2af3433d0a2}
nx OptIn
Is this a help?