[ubuntu] Error:file not found Grub Rescue please helllpp :(

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http://ubuntuforums.org – i just installed dual boot ubuntu and w7 but whn it booting error file not found on my desktop i do search on google but dodn't find the solution worked and heres my bootinfoscript Boot Info Script 0.61 [1 April 2012] ============================= Boot Info Summary: =============================== => Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks for (,msdos1)/boot/grub on this drive. => Syslinux MBR (3.61-4.03) is installed in the MBR of /dev/sdb. (Hardware)