A. Well, Windows Updates exist for a reason, which is to update components of the Windows OS & other MS software that might be installed.
In some cases, you have security updates to address various vulnerabilities in the OS, which obviously holds paramount importance.
A few other cases, bring about updates to vital components in your OS, say for eg. .net framework, visual c++ redist etc..
As such, you always have the option to read about the update and check for compatibility and other existing issues. So there aren't any Cons to speak of.
B. Approaches? Well, be it Win 7 or XP, I always choose to be notified about the updates. I prefer going through the list and choosing the ones that are top priority. Some I download later and a few I skip.
(Note: Win 7 classifies updates based on their importance)
C. By manual, if you mean the MS Windows Update website, there's isn't much to it. Open the site on IE, let the system detection do its thing and wait for the list of updates. Now, download and install the available updates, one by one.
D. Well, if you have chosen to download it in the first place, why fret over the installation? Can't really comment on this.
E. None that I'm aware of. In fact, ESET Smart Security keeps reminding me to install important updates.
If something should go wrong, uninstall the update. Else consider the Sys Restore option.
F. Auto > Notify > I choose the updates > download & install.
G. I wasn't aware of that.
Edited by ReviverSoft, 05 August 2010 - 12:47 AM.