i dont know what im doing

my antispam is off and it wont turn on it says im not protected and when i click scan comuter for viruses it wont let me it says my computer is not secured i hit the secure and it does nothing please help

Does this work…

Ad/remove programs > avast > uninstall > repair option…wait a minute and reboot

Any change?

ill try this is all new to me

Did you uninstall your previous used antivirus 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/