Windows Defender for Windows 8 (=Windows Defender+Microsoft Security Essentials)
If you don?t have another solution installed, Windows 8 will provide you protection with a significantly improved version of Windows Defender.
Improved protection for all types of malware. The improvements to Windows Defender will help protect you from all types of malware, including viruses, worms, bots and rootkits by using the complete set of malware signatures from the Microsoft Malware Protection Center, which Windows Update will deliver regularly along with the latest Microsoft antimalware engine. This expanded set of signatures is a significant improvement over previous versions, which only included signatures for spyware, adware, and potentially unwanted software.
In addition, Windows Defender will now provide you with real-time detection and protection from malware threats using a file system filter, and will interface with Windows secured boot, another new Window 8 protection feature.
When you use a PC that supports UEFI-based Secure Boot (defined in the UEFI 2.3.1 specification), Windows secured boot will help ensure that all firmware and firmware updates are secure, and that the entire Windows boot path up to the antimalware driver has not been tampered with. It does this by loading only properly signed and validated code in the boot path. This helps ensure that malicious code can?t load during boot or resume, and helps to protect you against boot sector and boot loader viruses, as well as bootkit and rootkit malware that try to load as drivers.
The same interfaces for secured boot used by Windows Defender, as well as all APIs used by Windows Defender, are available for use by our antimalware partners to deliver additional protection to Windows customers.
- Improved user experience. We have designed Windows Defender to be unobtrusive for most daily usage, and will notify you only when you need to perform an action, or critical information demands your attention. Windows Defender will also use the new Windows 8 maintenance scheduler to limit interruptions.
- Improved performance. Traditional antimalware technologies are well known for impacting system performance. It?s not uncommon that running antimalware software doubles the amount of time required for core scenarios like file copy and boot. As you read in last week?s blog entry, we have a lot of people working on system performance and Windows Defender dramatically improves performance on all key scenarios compared to common antimalware solutions on Windows 7, while maintaining strong protection. For example, Windows Defender with its full protection functionality enabled adds only 4% to boot time, while dramatically reducing CPU time during boot by 75%, disk I/O by around 50MB, and peak working set by around 100MB.
We?re continuing to work with antimalware partners during the Windows 8 development process so you have the best possible Windows PC experience no matter what antimalware solution you choose. We provide them with resources, such as the technical details of how we architected the performance improvements for Windows Defender, so they have the opportunity to make similar improvements to their products.