Koflach wrote:[color=blue]
> I recently installed Vista Home Premium and one of my hard drives is not
> showing all the space that it use to. The hard drive in question is a 1
> Tb hdd and was working fine in XP as were the other HDD's. When I
> installed Vista, all the other disk's worked fine except for this one.
> I have gone into Computer Management and it shows the drive as having
> 859 Gb of unallocated space that I cannot format. I am unable to create
> a New Simple Volume or any other volume types for this drive.
>
> Can anyone help me with this? Do you need more info from me?
>
> Thanks everyone.
>
>[/color]

Can you salvage the data that's on that drive, in other words could you
delete all partitions and start over?

If so it may be quickest to download Ubuntu which comes as an ISO file
and then burn a CD with it. You could then insert that CD without
damaging your existing setup, it runs from the CD unless you explicitly
choose to install it. You could then use the partitioning tool :GPARTED:
to sort the partitions out.

I really intend this as a last resort method but at least it's free. Of
course wait for other ideas first, and if unsure ask for more clues.
Ubuntu is generally very good at finding drivers that will work on many
machines.