Set Permanent Environmental Variable in Windows XP
Solution 1:
Per user settings command line:
% reg add KEY /v JAVA_HOME /t REG_SZ /d "C:\java\jdk-1.4"
For user only settings replace KEY with:
HKCU\Environment
For per machine settings replace KEY with:
HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
(Attention: there is a space in the last key, quote it with " !)