It's a windows update, and I'd have to run the updater again to get the error. That'll kill my connection's speed. So, I'll let you know ASAP. (like tomorrow) It's some security thing.
Windows 7 (64 bit) is not as well developed as its 32 bit cousins. Lots of third party stuff won't install, not because of the drivers, but because they left the 32-bit installer in it. Had problems with other updates, too, but it let me skip them. It won't with this secutiy one. it just downloads, tries installing, whines, repeat.
I'm not too worried about it - my phone has a stout firewall on it. (that's how I'm online - via a tether to my Android phone). Just annoys me and adds 3 minutes to the shutdown.