OS - All Windows Platform
Build 89

Steps to Reproduce :-

1.) Start the installation of JDK (j2sdk-1_4_0-rc.exe )
2.) During the installation process When it comes to the "Select Components" window in the installation wizard
3.) Un-check Java2Runtime Environment option, the space required paramenter does not change dynamically and remains the same,
whereas for other options like eg : demos,Java Sources when un-checked the space required parameter is updated.