I have the latest version of Java (java 6 update 5) installed. When I am logged onto the one account that I have with admin priviledges, the java plug-in for IE7 seems to work fine. If I go to java.com to test the installation, it tells me I have the latest version. However, when I am logged onto one of the regular user accounts and try the same thing, java.com tells me it can't detect java on my machine. As far as I can tell, my settings in IE are the same in the users' accounts as they are in the admin account, and java shows up in Internet Options/Advanced/Java (box is checked) in all the accounts. So why can't I get it to work in a regular user's account? The reason I tackled this problem in the first place is that there is a utility at mpccorp.com (serial number lookup tool) that I want to use. If I try it in my admin account, it works, but in a regular user account nothing happens except an error message in the status bar.
With the exception of Vista SP-1, which I can't get yet, Vista and IE7 are fully patched on this computer.
Incidentally, on three computers running XP in my office, I have no trouble with java on this web site.