Boot sequence does not save

Hi, 

I cannot log into my computer anymore because when I change my boot sequence it is not saved. I have created a bootable windows installer (because I need to install a eom key), a windows partition and a ubuntu partition. When I try to put the usb installer at first the ubuntu partition keeps opening and the boot sequence is resetted with ubuntu on top. This is an old ubuntu installation and I dont know the password anymore.

Furthermore my original windows had been deleted as an option in de boot sequence. So I cannot work anymore becuase of this. Please help