In Windows 8, Windows Defender replaces MSE as it does both antimalware and antivirus. Windows Defender provides only antimalware protection it is 'included with Windows Vista and Windows 7 and is available as a free download for Windows XP and Windows Server 2003.' (Source: ) It 'runs on Windows XP, Windows Vista and Windows 7, but not on Windows 8.' (Source: ) I believe that by default, MSE is a separate 'add on' for the operating system and must be downloaded manually. Microsoft Security Essentials vs Windows Defenderįor the record, Microsoft Security Essentials (MSE) provides both antivirus and antimalware protection. You may also likely have problems accessing files for example, downloads may fail to completely download, become corrupt, or are inaccessible. If you have both programs set for real-time file scanning, both programs will be fighting for the same resource at the same time. In other words, make sure that:Ī) both programs are not set for real-time file scanning at the same time, andī) both programs are not scheduled to do a full / quick scan at the same time That said, I suggest that you ensure both antivirus / antimalware programs do not conflict with each other, or you will run into resource issues that will cause your computer to slow to a crawl.

In my opinion, using two antivirus / antimalware programs is better than one for the same reason you would seek the advice of two independent doctors for a life threatening illness.

What is your opinion of having two antivirus programs installed instead of one? I have Microsoft Security Essentials and Grisoft AVG antivirus.

Should i run windows defender and avast