Have you got Java? www.java.com
Even if you do, try the latest if you don't have it.
Also, if the installer for the English only version doesn't work, try the International version one (and vice-versa).

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-