Here you go
From a working computer download and install IMGBurn
to your desktop.
Open IMGBurn via the newly created icon on your desktop, or by pointing to Start->All Programs->ImgBurn->ImgBurn
Push the large "Write image file to disk" button.
Right under "Source" and next to "Please select a file" push the
Browse to and select the Knoppix image file on your desktop.
Place a blank CD-R into your clean system's CD Burner, and press the large button that looks like a page going into a CD in the bottom left of IMGBurn.
Now place this CD into the non-bootable system. Configure the system to boot from CD. You can usually do this by pressing F10, F11, or F12 (try all of them if unsure) to bring up configuration options, and select CDRom as your boot device. Some machines will automatically attempt boot from the CD if one is inserted.
When you see this screen,
Press enter, and wait for Knoppix to boot.
On Knoppix' desktop, you should see an icon for your hard disk (Looks like
Right click the drive, and select "Change Read\Write Mode". Press "Yes" at the prompt.
Now you have ready access to you hard drive. You can drag and drop files/folder to another hard drive, a flash drive or burn the data to disk.
For safety sake...Note that the files with the following extensions should not be backed up:.exe
Once the files are done moving, press the large K button in the lower left corner of the screen, and select Log Out...
Then press "Turn off computer".