Pondus
2
what AV did you use before installing avast? … did it come with a preinstalled trail AV like Norton / McAfee / TrendMicro ?
did you uninstall it before installing avast?
did you run the vendors removal tool to clear any leftover files that may conflict?
tools found here, run and reboot. http://singularlabs.com/uninstallers/security-software/