I have a HP 8570w with Windows 7 and today I installed Ubuntu (14.04) next to it by usb, after creating the right partition and such. My problem is that when the pc boots it automatically starts up windows 7 and there is no option of choosing Ubuntu.
While I was installing Ubuntu I unplugged my Windows 7 HDD so I wouldn't accidentally partition it. I installed Ubuntu, shut off my computer, plugged back the HDD, rebooted (and using the BIOS boot menu, selected Ubuntu). Ubuntu recognized the HDD with Windows 7 on it, and can mount it fine.