I know two free softs would do dynamic disk recovery best.
for partitions recvoery, partition recovery would be the best
for partiton data recovery, data recovery wizard can do the best
hopefully it can help more ;)
just have a try to fix your partition
the disk management utility may help you, check the drive letter and assign it.
if your partitions cannot be shown in the disk management utility, maybe the data in the partitions have lost
for sure, backup work can guarantee total security