I, too had this problem with the Vista build. I bought this software yesterday because I wanted to break my large 500GB partition so that the system was easier to backup. I still haven't been successful. I try to create a new partition and set the size. It says ok..reboots does some work, reboots again. I go in and see that the C: still exists and is still the same size. I did this several times and it never worked. No messages in the log file. There were always 3 messages in the log denoting the begin or end of a particular phase of the re-partitioning. I then went and had Vista resize the partition. The size it gave me was far less and it took hours. I said..ok now that Vista has started it maybe DD can finish sizing this out. I moved some files from my C: to my new X: and tried to add space to X. It started working and then rebooted, and rebooted, and rebooted...everytime it would finish it's work and head towards Vista, Vista would bluescreen. I got my Vista disk and did a repair that let me in. Looks like I will have to defrag and try to grow the partition using Vista's tools again.