Windows 7 Updates: Unable to Download code: 80246008

Great - so far so good :)

Open Windows Update
In the left pane there should be a 'Restore hidden updates' link - click on it, and it'll tell you if any are hidden or not.

Back in the Optional updates list, I'd advise hiding all the Language updates, any Bing stuff, and possibly the NVidia updates (you may want to consider getting the update from the manufacturer's website, as it may well be more recent than the offering on WU)

Install any of the OS updates that look as if they may be useful.

Then check the update history - do the entries there reflect what you've now installed?
Then check the Installed Updates listing - does that look OK?

If you want an independent check to make sure that all security updates are installed, install Belarc Advisor (www.belarc.com) and see what it has to say. (I love that program!)

www.belarc.com

Belarc is weighted to use on Domain Networks, rather than home networks,
The score that you see reflects that bias.
I also only get a score of 1.25 - if you click on the link beside the score, you get the details of the assessment.
As far as I can make out, that score is perfectly normal for a 'default' Peer-networked computer.

I tend to stay as far away from such programs as I can get.
Most of the time, all such things are is an interface into already-existing tools in Windows. The more you learn about actually using and managing Windows, the less you need such tools.

AVOID anything that claims to be a registry cleaner/optimiser/defragger - it WILL cause more problems than it can ever solve.

If you want to extend the capabilities of the Windows tools, then the Sysinternals suite of tools does some serious work - Windows Sysinternals: Documentation, downloads and additional resources.