I used to be an AVG user, but[b] i restored my computer to factory settings [/b] today, and I want to do most of the stuff diffrent this time, so I thought i try Avast...
did Your computer come With a factory installed trail Version antivirus...like Norton / McAfee / TrendMicro ? ....has this now been restored also?

if so, this must be uninstalled first…then run the vendors removal tool to Clear any leftover files that may conflict

Tools found here http://singularlabs.com/uninstallers/security-software/