Grub rescue problem after installing Ubuntu 12.04 LTS

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http://askubuntu.com – I have dual boot with Window 7 And Ubuntu 11.10. Yesterday i tired installing Ubuntu 12.04 LTS , by Manually removing all Ubuntu 11.10 partitions, creating new partitions and installing Ubuntu 12.04 LTS, But then i got this error. error: unknown filesystem grub rescue > The thing is when i let Ubuntu do partitioning for me it solves the problem, But i always do my own partitioning and it was working with me before, what had changed in Ubuntu 12.04 LTS? I have both windows 7 And Ubuntu 12.04LTS on same Hard Drive, And the Partitions for Ubuntu that i have are : / /boot swap /home I (HowTos)