Please, I'm wanting to change the size of the partition on which Windows 7 is installed. Partition Guru for this SSD does not change the size because some free clusters are marked as used in $Bitmap. How do I effect that change in $Bitmap?
If you want to shrink the partition you could do that viq disk management by clicking with the right mouse button and selecting shrink volume.
If that doesn't help you could give it a try with a different 3rd party partition management tool.
I had this same issue and solved it by going to Tools -> Check Partition Table Error (F12). There was an error which I had Partition Guru fix and then hit Save All (otherwise the fix isn't applied).