Thanks Harry, for all your help and wisdom.

Allow me to try to explain the circumstance whereby I begun to look at Knoppix.
It started from two angles. One, I had a JPEG file in my portable hd (FAT32 formatted), which has strange characters in its name. I tried to delete, move, rename it in my XP o/s PC, but it would not allow me to. Previously, I could see the image, but only recently, no image software is able to view it. It seem to have morphed into an indestructable file. I tried using Unlocker, MoveOnBoot or Killbox to delete the file. I even tried File Shredder of Spybot & Destroy, but all to no avail. So, this led me to Knoppix, as I read from some forums that Linux could help me to delete the file. I had the portable hd attached to my good PC and booted with Knoppix. But I still cannot delete this JPEG file. However, using one of the image software in the Knoppix DVD bundle, I could see the image. That is all and nothing can be done to the file.

I did the unthinkable here. In my good PC (booted up with Knoppix), I tried to move the JPEG file into another directory in my NTFS formatted hd of my PC. I also tried to use Knoppix to move some other files in my NTFS file-system of my PC. But I could not. I will start another thread to seek advise on this, but this here is just to give you some background of how I got involved with Knoppix.

Two, I had another corrupted PC, with my XP o/s corrupted beyond repair. So, I tried to use Knoppix to boot to see the files. I can see the files alright. That was yesterday! I also did the unthinkable yesterday. I had my portable hd, where the JPEG file is, attached before I booted my corrupted PC. I tried to move some files in my corrupted PC and also I tried again to purge the JPEG file from my portable hd, but all not successful.

Today, when I booted my corrupted PC using Knoppix, it was successful, but my hda1 (where my file-system is) is officially gone!
This is the message I see when I click on my hda1:

Sorry-kDesktop
service'/UNIONFS/usr/share/application/kde/kfmclient_dir.desktop is malformatted.

PS: No worries, I had already copied out all my important files from my corrupted PC using BARTPE, which I downloaded and burned into a bootable CD before I started experimenting with Knoppix.

Now, I offcially cannot read my file-system using Knoppix and I don't know what wrong I did. I could try to find out why as I am excited by the potential of Linux and wish to show my defiance to Microsoft but as I am not a techie, I fear my resistance to Microsoft may be futile.
Just awhile ago, my Knoppix froze on me and I did not do much other than click a few of the icons on the toolbar to explore. I feel that if I am committed to Knoppix, I should try the hd installed version. The DVD live version is just too unstable and slow for me I guess.

By the way, thanks for your generous help and I really appreciate it. Right now, I had "force" removed Knoppix from my DVD drive and booted up my corrupted PC using BARTPE. I can see my file-system and all the files are still there. Should I now decide to explore Knoppix further, I will have to decide to re-format my hd to FAT32 instead of NTFS, which Windows desires. I am thinking of having a dual boot system, with both XP and Knoppix.
I will do some research on this first and will be spending more time on this forum reading all the posts here before I plunge in further.