linux KDE crashed

I had my computer crash on me not to long ago and KDE will not start up.  I get to the login but after that it freezes.  How do I repair KDE?  I'm not very good with Linux so be very elementary with the answer.  I'm on the Knoppix distro.
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First check your HD for how much space there is on it. If you have plenty of it, run apt-get update to update the software repositary (you need a working internet connection for that to work), then run apt-get upgrade, this should upgrade your system and also repair anything that doesn't work. This upgrade can take some time...

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To get out of the hang, you may have to kill the graphics server (X server?) by hitting Ctrl + Alt + Backspace. If all is OK, you should be able to get a command line interface, from which you can run the utilities mentioned above.
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