Have you rebooted since the reconfigure?  If so, Windows simply probably doesn't look past the extended partition on the disk (since it must be the last partition).
[IMAGE]There any a few of the same question on this form about this subject most of which i have read in my preperation.  I had copmpleted the steps as perscribed by dell, open manage server please see my screenshot.  It appears I have missed a step somewhere.  Thanks in advance. [IMAGE]
Adding more disks to Perc 4e/di RAID 5