I booted Ubuntu 12.04 LTS from a LiveUSB, and then selected the option to Install Ubuntu to my hard drive. I allowed the installer to partition it, giving Ubuntu 50GB and leaving Windows 7 with 200GB. However, when I boot, It still boot straight into Windows. The only way to access GRUB is by booting from the LiveUSB, although this can then be removed.
How do I access the GRUB menu without using the USB?