>>408344928
general guides on expanding partitions help
idk if you really need the specific tool that answer mentions but yea...
your best bet is to google guides on resizing Windows boot partitions
there should be at least one toms hardware article or something
I can't say for sure if Windows Disk Utility can do everything you need since you may need to be in a recovery boot environment to resize your actual partitions (read: they probably can't be actively mounted while you do this)