What improvements/additions to security have been made to Windows 8 as compared to Windows 7?
closed as not constructive by ChrisF, Oliver Salzburg♦ Oct 24 '12 at 11:20
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Well first off, there is UEFI to protect the pre-OS environment.
You can read this post on how security has been improved since Windows XP. Smart Screen is now enabled for apps too.
A major improvement is the fact that Flash is now managed by Windows Update, flash is buggy and with it under Windows Update, it's a little more safe.
It should also be noted that a new version of Windows Defender is included and it includes the features of Microsoft Security Essentials(it's awesome).
Based on information from these articles there have been many improvements:
Microsoft use better practices when developing code:
MS have worked to reduce the likelihood of attacks.
Windows defender is improved.
Protections are in place to stop malware that effects parts of the boot process (called SecureBoot).
SmartScreen has been improved.