OK, if I understand the situation correctly, the problem is that you are trying to shrink the current system drive - C: - while the system is running. Microsoft's software only allows you to do change the size of dynamic partitions, so it's trying to convert the partition to a dynamic one, but it can't do so because it is the system drive and the disk management software does not allow you to change the active partition...
In other words, you can't do what you want with Microsoft's disk management software. However, other partition management software (Easeus, Paragon Software, Acronis, GParted) will let you achieve this, so I suggest you use one of those other packages...
http://www.makeuseof.com/answers/resolve-dyanamic-disk-partitioning-error-windows-7-home-basic/OK, if I understand the situation correctly, the problem is that you are trying to shrink the current system drive - C: - while the system is running. Microsoft's software only allows you to do change the size of dynamic partitions, so it's trying to convert the partition to a dynamic one, but it can't do so because it is the system drive and the disk management software does not allow you to change the active partition...
In other words, you can't do what you want with Microsoft's disk management software. However, other partition management software (Easeus, Paragon Software, Acronis, GParted) will let you achieve this, so I suggest you use one of those other packages instead.