If you are using IE9 then you will surely know about SmartScreen feature, it contains the list of many malicious links and as you visit different websites it IE9 checks and if it find any such link then it will warn you regarding the link.
Now Microsoft is planning to add the same feature in Windows 8 too,According to Long Zheng this feature will have two purpose, to reactively check the file system and proactively prevent any downloaded applications from running that are unknown to the filter.
You can enable or disabled this feature from Folder Option.
Hmm seems to be a nice feature.
