The easy way to run java application on windows XP:
1. Install j2re-1_4_0_01-windows-i586.exe or j2sdk-1_4_0_01-windows-i586.exe
2. Set path: Windows XP: To set the PATH permanently: 
	Control Panel > System > Advanced tab > Environment Variables. This will bring up a window in which you can edit system variables, including the PATH variable.
3. Then, to run application, right-click the folder contain the application, select "Open Commenad Window Here", then type "java Vocab"