Sometimes important Windows Updates are unchecked by default

[Jskid]

I've noticed on a few systems in Windows Updates some important updates are unchecked by default, for example Internet Explorer 10 For Windows 7 x64-based systems and various updates for the Microsoft .NET Framework 3.5.1 on Windows 7. Why is this and should I still install them? Why would they be important but not installed by default?

 

[St1ckM4n]

Depends on what your Windows Update settings are like. Mine is set to "notify" only, and every since update is unchecked by default.

.NET framework is kinda like a software that is required for other software to run ... e.g. "iOS v5 or higher is required to download and install Instagram on your iPhone"