unable populate volumes find missing gibs

I recently installed the Vista 64 bit Beta 2 on my computer and have since discovered that I seem to be missing some space. I have two hard drives totaling 200GiB (one 120GiB, one 80GiB, both are SATA drives). However, when I add up the total of the partitions in Windows Explorer, I come up about 40GiB short. I believe the reason for this may have been that I neglected to create a final partition on each drive and just left the free space unallocated. When I am in Explorer, and go to Properties, Hardware, select one of the two hard drives, click Properties, Volumes, and try to populate the volumes, Windows confronts me with an alert that reads: "You can not populate the volumes on this disk. You are not an administrator or backup operator." Now, since I am the only account on the operating system, I would assume that I AM in fact the administrator. Unfortunately, Windows does not agree...can anyone help me out please?? How can I find the missing GiBs and make them accessable?

Have you tried looking at the disk partitions using Disk Management?
"Dean Valentini" wrote in message

I recently installed the Vista 64 bit Beta 2 on my computer and have since discovered that I seem to be missing some space. I have two hard drives totaling 200GiB (one 120GiB, one 80GiB, both are SATA drives). However, when I add up the total of the partitions in Windows Explorer, I come up about 40GiB short. I believe the reason for this may have been that I neglected to create a final partition on each drive and just left the free space unallocated. When I am in Explorer, and go to Properties, Hardware, select one of the two hard drives, click Properties, Volumes, and try to populate the volumes, Windows confronts me with an alert that reads: "You can not populate the volumes on this disk. You are not an administrator or backup operator." Now, since I am the only account on the operating system, I would assume that I AM in fact the administrator. Unfortunately, Windows does not agree...can anyone help me out please?? How can I find the missing GiBs and make them accessable?