I get an error message for both saying "the package is broken"
Download the latest avast Free (currently, 6.0.1367) (NOT the trials, but the Free edition). Run the downloaded setup.exe over your current installation. Once the new installation finishes, reboot. After the reboot, let avast update itself (do not force it).
If you have more problems, please start a new topic, as this one is about different issue than yours.