working with Knoppix, mount HD, instal software..

[a_hic]

Hi all,

I’m a newbie Knopix (Linux in general) user,

My pb began when i want to use nessus, I always got : login failed, although I did the right things : starting nessusd then nessus and using root passwd, so thought to reinstall it -nessus- , As I m working From CD and I use VMWARE , I didn't
understand how things works,
I downloaded nessus 2.24 in the Windows Partition i.e. C:

My pb is :

-how can i fond the Windows partition, although i did : fdisk -l , I get only one partion sda of 4GB, I know that was made with VMWARE, and I got this message :
/dev/sda doesn't contain a valid partition table .

-how do I mount the HD (ie C , When I looked in the /dev directory I didn’t find any things like hda or sda .....I tired to do :
mount -t ntsf /dev/sda /mnt/wint but I couldn’t

I know that i can download these file diretely , but want to understant the pb

I couldn't access to Internet from Knoppix otherwise I had to download directly files from it, another question:
when we install softwere it must do it on HD,where?