Ubuntu 12.4 not listed while in boot menu

view full story

http://askubuntu.com – I am using Dell Inspiron 17R with Windows7 as the primary OS to boot my system up. I am new to Linux and to begin with, i thought of installing Ubuntu 12.4 AMD 64 bit version on my laptop. Today i performed a successful installation on my laptop but when i reboot, it doesn't show me the Ubuntu OS in the list (I can only see Windows7). Is there any way to bring up the Ubuntu entry into this list? While installing i selected the option to have both Windows7 and Ubuntu OS on my laptop. The root drive for both OS is C: drive. Hence i split the drive into two (250 GB for Windows7 and 250 GB for U (HowTos)