From that explanation, I think JQS should not be accessing the outside world.
I could not remember if I allowed the kernel or system when I had XP. I only use my system to surf. Apart from that, I make sure that my Windows can perform Windows update, and can query the time server to keep the clock running.( control panel, date and time, internet tab ) Try disabling kernel and system and see if you can still do these 3 things. And if not, enable one by one and re-test.
From my security perspective, I don't care if a component was originally designed to talk to the internet; if I don't use it, then it can be disabled.
Every time you install or update Sun Java Runtime Environment, it puts a jusched startup entry in the startup list and a Java Quick Starter service entry in the services list. Neither one needs to load during startup and run in the background.
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