I have Windows 7 with Microsoft Security Essentials with Avast Internet Security 2015 installed on my computer…no issues thus far…at least that I’m aware of. I just realized you shouldn’t have two anti-virus programs running at the same time…should I remove MSSE and if I should, do I have to remove AIS 2015 first?
Why Using Multiple Antivirus Programs is a Bad Idea http://blog.kaspersky.com/multiple-antivirus-programs-bad-idea/
General: Uninstalling a third-party antivirus software https://www.avast.com/en-eu/faq.php?article=AVKB11#artTitle
do I have to remove AIS 2015 first?No