Pondus
7
A few weeks ago I got a new computer running on Windows 8 (x64) and decided to use avast again since it has served me well in the past.
did your new computer come with a factory installed trail AV? ..... like Norton / McAfee / TrendMicro
if so, this must be uninstalled. when done it is recomended to run the vendors removal tool to clear any leftover files that may conflict
tools found here. http://singularlabs.com/uninstallers/security-software/