Originally Posted by fantasta
The trouble with firewalls is that they can continue running even when they seem to be disabled,and they can shut down some ports. Check this little application,EnumProcess :
Sometimes anti-virus software may interfere as well. Some people had to uninstall their anti-virus/firewall applications for the time of installing the patch.
One more thing which may be useful: use an administrator account to install the patch. When I was installing from a limited user account, UAC dialog appeared, I typed in the administrator password, and, after some time, the patch didn't finish the install, it just hung. When I switched to the administrator account, everything went smoothly.