Resizing with GParted makes (other) Windows 7 partition unusable

Honestly, anytime you attempt to expand or shrink a partition, (regardless of it's file system or the OS that uses it), it's a risky gamble. Yes, it may work, and yes, you may never have issues, but the risk is there. Ideally, you should just reformat and create the partitions in the sizes you want and be done with it. I would also recommend NOT using "soft partitions" (aka taking one hard drive and dividing it up). In my opinion and experience, using a whole hard drive (aka "hard partition") is the better of the two methods (soft vs. hard partitioning). It's not like hard drives cost a ton of money these days anyway.

For Windows Vista and Windows 7 I highly recommend using it's built-in partition manager to shrink it's own NTFS partitions. Apparently there are some tiny differences between XP-era NTFS and the NTFS that Vista and Windows 7 use. Only tiny, but enough to cause trouble for gparted. Window's own partition manager is also much faster at shrinking NTFS partitions.

Not a direct response for your problem, but I hope that people who end up here via a search will see this advice.

with windows vista and windows seven you must use the shrink feature of the disk management snap in Computer management if you want to shrink or enlarge a windows vista or windows 7 partition.

I had a very similar problem resizing partitions. Make sure you DO NOT round to cylinders, it screws up NTFS. When resizing (I used GParted), untick that option for both the Linux and Windows partitions.

Hope this helps!