I used software called Paragon Patition Manager under Windows a lot, for that task. It can resize system partition by inserting a kernel module that's activated on the next boot, resizes partition before it gets mounted.
Back up data first! Older versions of GParted from sysresccd have happily resized NTFS partitions for me while blowing away the data. User error, probably. The GParted live CD has worked, the few times I've tried it.
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