What you are seeing is the No Skin Simple User Interface, which you have to have selected or you are using the wrong file name in your shortcut ashSimp2.exe is the skinless and ashSimpl.exe is the skinned version of the SUI.
The fact that the options on the right click menu don't appear to work, there is something wrong with your installation.
Try a repair of avast. Add Remove programs, select 'avast! Anti-Virus,' click the Change/Remove button and scroll down to Repair, click next and follow. You need to be on-line to do this.
If that doesn't work (right click selections don't work) try, uninstall, reboot, install, reboot.
It would probably be best to download the latest version of avast and save it to your HDD, somewhere you can find it again. Use that when you reinstall.