I have been trying to install Yosemite on a hardrive partition on my dell Inspiron laptop. I installed it however when trying to boot I get an error: boot0ss: error. I now just want to get back to windows however I have no idea how to select which hd partition it boots from. I can only choose to boot from hd or usb. I have seen some solutions which include changing settings in the os but since I have no running os I can't do that. How do I boot windows again?