install ubuntu 12.10 issue

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http://askubuntu.com – I'm installing Ubuntu 12.10 along side windows 7. I have installed windows then Ubuntu 12.10, each on a different partition. while choosing where to install boot loader I left the default, it was my hard disk name in general not a specific sda or something like that. everything was fine and after rebooting again windows start up logo appeared. I tried to add Ubuntu to Windows boot list using easyBCD and it returned success. Now I can see it windows boot menu but after opting Ubuntu a message and grub > prompt appears. I'm totally confused, help please. thanks and happy new year. ;) (HowTos)