The solution, in a nutshell, is to disable your firewall. If you’re
using McAfee Personal Firewall Plus, F-Secure Internet Security, Norton
Internet Security or another Firewall vendor, see its respective
support page for assistance in disabling it (temporarily). If you’re
using the built-in Vista Firewall, keep reading.
* Open the Control Panel and select Security.
* Select Turn Windows Firewall on or off.
* Select Off (not recommended), click Apply and then OK.
* Back at the Windows Update screen, click the Try again button.
* The download(s) and installation should start…
* and this time successfully install. If a restart is required, make sure to re-enable your Firewall once your PC restarts.
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