system
7
Perhaps you should read how to install the software?
http://www.avast.com/en-us/faq.php?article=AVKB3#artTitle
Always CUSTOM install
http://s26.postimg.org/uqgs839y1/Custom.png
Within avast you can add or remove modules whenever you wish, it takes a few seconds to do so …
http://www.avast.com/en-us/faq.php?article=AVKB96#artTitle