First of all, you can't run KDE over puTTY, because that's a terminal client. What you want to do is to set up a remote X-windows session.
X windows is the basic, low-level system used for drawing lines, boxes, bitmaps and so on on your screen, and handling keyboard and mouse events. KDE is a desktop environment and window manager; it runs on top of X (i.e. it uses X to display its lines, boxes and bitmaps).
What you are wanting to do is to start a X *server* on the client machine (the one you're running puTTY on at the moment), and have the server machine (the one running KDE at the moment; the X *client*) open a login session on that X server.
Instructions for the server-side are here: http://www.tldp.org/HOWTO/text/Remote-X-Apps
The fact that you're using puTTY suggests to me that you may be using Windows/MacOS/Risc OS or some other system, so you'll also want information on non-Linux X servers. You can get that from http://www.xfree86.org/
Once set up, starting a remote KDE session is easy. Start the X server, login with puTTY, and type:
- host is the IP address of the computer running the X server
- A is the number of the terminal on that computer (this is normally 0)
- B is the number of the X server on that terminal (usually 0)
- /opt/kde3/bin/ is the path where KDE is installed
Hope that helps,
— Robert Lee.