Unavailable space on new hard drive

I have a new 250G Hard Drive which has somehow got divided into two. Vista is installed on an 80G partition and I have 152G Unallocated Space. I have asked around and the thing I cannot seem to get anybody to understand is that (a) the 152G is NOT displayed in the list of drives at the top in Computer Management/Disk Management and (b) when I highlight this Unallocated Space, none of the usual options - Format, Shrink Volume, Extend Volume, New Simple Volume etc. - are available to select.
Therefore I am limited to using just 80g of my 250G Hard Drive and I would be grateful if anybody can come up with a solution so I can begin using this 152G.

 

There is a nice little, easy to use program that may help you out.

Gnome Partition Editor aka. GParted

http://www.majorgeeks.com/GParted_d5757.html

Give that a crack and let us know how you go.

 

All you need to do is allocate a letter to the drive and it will be available