bootloader failer

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http://forums.fedoraforum.org – i have been using DELL STUDIO 1450 . I Have a problem in installing fedora 17 in my laptop. the problem is during last phase of installing the fedora 17 (64) i m getting bootloader failer. so i restart the system i m in the GRUB RESCUE MODE . i think fedora 17 is fully installed except bootloader. so kindly help me out of this problem. i have another query , after i failed in installation of fedora 17 64 bit in my laptop i tried installation of fedora 16 32 bit . its working fine but i dont have any internet connection in my home so i cant install the plug-in , other supporting the packa (HowTos)