Installed Ubuntu 12.04 and no Menu on boot!

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http://askubuntu.com – I had installed Ubuntu 12.04 on a separate partition, in ext4 format in my comp, which initially had only Windows 7 .I had done the installation from a Live USB, which gave me the option Install on boot, in a GRUB menu. I had chosen the option of "Installing Ubuntu alongside Windows". I had chosed the particular partition duing the install, and in mount part, I had given "/". And I chose my only hard disk drive as the location to install the boot loader. The whole install process was over, and i was asked to restart, and while doing to it asked me to remove my installation media, which in my c (HowTos)