In a situation where you attempted the installation of another OS I would opt for the use of GParted Live for cd you can also see written to a small usb flash drive. You first remove the new, existing partitions in order to start off with a fresh C primary.
From the dropdown list of file systems you simply select "ntfs" in lower case letters not the default ext 2 when going to format it. This should also eliminate all traces of the Grub installer used by many distros that is automatically installed as well as replace the traces of VFat in favor of NTFS.
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Evidently while the 7 install went all well something of the other OS is lingering that has to be removed. That little bit of Partition Table info is still Linux where Windows cannot see onto any Linux drives or partitions as a rule.
This would be one explanation why your drive isn't being seen in the DM even with a 7 install on the drive itself since it hasn't been initialized there yet. GParted is preferred as the best since it is cross platform and will insure the drive becomes all MS. The latest release in iso is 126.1mb in size found at
GParted - Browse /gparted at SourceForge.net
The General Documentation for use is seen at
GPARTED DOCUMENTATION - GENERALITIES Some additional screenshots can be viewed at
GParted -- Screenshots
Before the use of the drive tools on the 7 dvd or for any other paritioning program to see a new C primary created you could also use a security tool to nuke the drive entirely. A security tool like
Eraser will literally write binary zeros to the drive over and over again while run wiping any form of data from it.
That would be rather unnecessary for this however. Also if you do not want the 100mb System Reserved parition which houses the BCD store and boot files keeping them separated from the main C volume(helps in rootkit protection) you could use a 3rd party drive paritioning program like GParted as well.
The suggestion for GParted is to allow you to also see just what is presently on the drive for a file system as well as being a free program to do away with any remaining traces of the other OS.