Which one is the best, restore grub load or reinstall 64bit Fedora 16

[yujian]

My notebook is updated to 8G memory,  and I reinstall a Win7-64bits system,
so the grub info of F16 is lost.
Now I need to restore the grub load info of F16, or reinstall F16 64-bits
version.  I do not know how many difference of 32-bits and 64 bits of F16.
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