Disable automatic updating vista
By enabling your system to check for the latest version, you keep your system secure with the latest patch updates.
We strongly recommend that you do not disable the update feature.
If we make the user a local administrator, then it is not grayed out anymore and they can set the option.
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To save memory and CPU time turn off the automatic update system in windows.
You can always check manually for updates and most users have no problem with that.
I've just installed the newest version 1.6.0_05-b13, but get the same results.