We have a guide for using VMWare (and I think there's a free VMWare player if you are using Windows): http://androidforums.com/desire-all...any-iso-vmware-player-updated-jan-2012-a.html.

For VirtualBox it shouldn't be too different. Download a GParted ISO, create a VM using it with VirtualBox, then the actual GParted bit should be the same.

Most Linux distros use it for installation, so if you boot off a linux live CD or USB key you should bave GParted available there. If you can get the machine to see the phone then you should be able to partition the card using GParted from the system tools menu.

All of this is however moot if you are using 4Ext Touch recovery. I wouldn't trust CWM or Amon Ra for the Desire to partition a card, but 4Ext is fine, and if you have it far simpler than setting up GParted unless you already have it.

Just remember to back up the card to a computer first, as partitioning will erase it.

 

Well I've never run a VM on Windows, so don't count as an expert here.

As I recall the process, you start VirtualBox, tell it you want to create a new virtual machine, follow the instructions to set up a basic VM (I'd guess set type as a generic linux). When you first run the VM it will ask for install media, at which point you direct it to the GParted ISO you downloaded. Then we just hope it sets you up with a working VM!

 

If your phone is s-off install 4ext recovery using the guide in this forum & use 4ext to partition.

If you're not S-off run revolutionary first (there's a guide for that too).