On physical disk 1 you have 2 partitions (127MB and 99.87GB) and there's a volume (D:) that is spanned on those 2 partitions.
Same for the disk2 : the volume E: is spanned across the two partitions.
You cannot convert those disks to basic without removing the spanned volumes.
So you will have to backup the content , delete the volumes, delete the partitions, revert the disks to basic, create a new partition (and a new volume) on each disk and then restore the content.
To backup the content if you are concerned about permissions on folders and so on, I suggest either robocopy or imagex (those are microsoft tools), although in most case simply copying the files on an external drive should be enough (depend on the content of the volumes).