Boot camp not working on windows

I've successfully installed windows 7 on the imac and have been using windows 7 for a while. But just today when i decided to go back to Mac I realised I can just start up in windows.
I clicked the boot camp in the system tray on the taskbar, and tried to open the boot camp control panel, an error poped up saying I have to have admin privileges to change the startup disk.
So i run windows on an admin account by activating the hidden admin account, and still the problem presists.
I tried holding Alt while starting up but only the disk with windows was shown, and just one disk, the one with mac was missing. Also i have tried to change the starting disk using the command line found in the support in this website but still no change.
Any help is appricated!

On the disk Management I tried to set the disk with the OSX partition as active and restarted, and ended up having Missing Operating System error.
Fortunately I managed to solve that problem but still I am unable to switch back to Mac.
Help is needed and much appreciated

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