Hi Jimbooj,
As of now there is no way to get the username or password for a VM. Your best bet would be to delete the VM and recreate it from the saved VHD (Note that deleting VM does not delete VHD. You can still find it in Azure blobs)
Note that D drive is temporary storage on the VM. Any data stored on D drive will be lost with deletion of VM.
You might also want to refer - http://social.msdn.microsoft.com/Forums/windowsazure/en-US/92a55a09-19c9-4731-b7a6-2b1a9ea909f7/forgotten-vm-password
Regards,
Ojas Maru ( My blog )