Recently I have noticed that when trying to update Adobe or Java, you get an error message stating Error 1606: Cannot access network resource. It may be a network resource that no longer exists, but on the machines that this happens, it will do it for more than one application. The applications that I have seen it on is updating Adobe, Java, and also when configuring a new user under outlook. When you open outlook, Windows Installer pops up and then the error message will appear. The two machines that have had this problem were Windows 2000. Forums say they have seen it on XP as well.
I found a fix that says to change a registry setting under common administrative tools, but it did not work.