Error message pops up while installing java (java1.6.0_u2 b06) from java.com using Mozilla (1.7) or firefox (2.0.04) browsers.

Steps to reproduce :
1) Uninstall Java if java 1.6.0_02 is already exist. (Any other lower version need not to uninstall)
2) Open mozilla or Firefox and go to http://www.java.com
3) Try to install java from that page.
4) If this is the first trial, it will ask to add java.com into add-ons installation list of the browser, click on 'allow' button and add it.
5) When instaltion start its throws an error popup saying (see attachments)
"Installtion of package "http://java.sun.com/update/1.6.0/jre-6u2-windows-i586-jc.xpi failed with-203"

This particular bug is not reproducible alwyas. But for a newly/freshly installed machine (with Windows Vista), its surely possible to reproduce this bug.