I am not a very big fan of Microsoft. Every other release of the OS is buggy and untested and when the public is done beta testing for them they release a more stable version. I think IE is bloated and disliked Bing. I hated the fact that they made Office 2010 so that it was no one could open a docx or xlsx unless they bought the upgrade. So pretty much I wouldn't trust their antivirus, since they totally dumped Microsoft Security Essentials when they launched Windows Defender.