Ubuntu install help

i have windows 7 installed on my laptop. i decided i wanted to dual boot ubuntu. i have done this before so i partitioned my hard drive and install ubuntu and the new partition. last time i had this setup the GRUB boot menu installed with ubuntu so i can pick what OS to boot to. This time it did not install. so when i turn on my computer it goes to windows 7 automatically. is there a way to install the GRUB menu?
thanks

EDIT: i solved my problem. i just reinstalled ubuntu and it fixed it