When trying to silently install a JRE version that is already installed we get a network
error 1316 saying that the file jre1.6.0_04.msi is not readable.

To reproduce:

Run the following script twice:

start /wait jre-6u4-windows-i586-p.exe /s IEXPLORER=1 MOZILLA=1 JAVAUPDATE=0 WEBSTARTICON=0 AUTOUPDATECHECK=0 JU=0 reboot=suppress /l E:\Java\JREs\win\install.log /qn

Verify the result of the logfile.
Instead of producing the error 1316 it would be better to do
nothing or report "already installed". An rror is not suitable I think.