Many people are using grub to boot vista without a hitch so far.
This is not the best way as:-
Vista sp1 will fail if grub is the boot loader
Encrypted drives and bitlocker issues
Any function relying on trusted Platform Module will fail
the correct way is to chain load boot loaders vista boot loader if you select linux will load grub
http://neosmart.net/wiki/display/EBCD/Ubuntu
Also before trying to resize hd defrag and
use ubuntu guided partitioning as gparted live iso corrupted ntfs file system and required knoppix fixntfsCode:chkdsk /f
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