I just successfully moved my system-partition to the beginning (after the 100MB) since I wanted to get rid of the D: partition (see my attached screenshot earlier). I only had to delete d: and move the left 'border' of c: to the beginning.
I used the free Business version of Partitionwizard (didn't try Home). It works very well and you just have to register in order to use it. The mail with the key arrived within minutes.
If it sounds like advertisement - well I almost gave up looking for a free application that works.