I am going through something similar. None of the toools I have tried will resize the NTFS partition. I just downloaded the gparted live CD, and I am going to give that a shot. Some things I've found in my research that may help you:
Although you should not need to, it won't hurt to defrag the NTFS partition. Also, there may be unmovable data at the end of the drive that is preventing resizing. Try turning off the paging file, as well as the option to let Windows manage it for you. Then, reboot in safe mode and delete the pagefile. Defrag again. Then reboot using whatever has your partitioning tool and try again.
Finally, there are actually two parts to this. The first is resizing the filesystem and then resizing the partition. The ntfsresize utility will resize the filesystem, but not the partition. The other tools (parted/qtparted/etc.) will resize the partition.
As always, nothing is foolproof. Backup everything important before beginning.
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