Ese problema ha sido descrito en la FAQ de Lavasoft:
To solve the problem you experienced, you will need to remove a possibly corrupt settings file for Ad-Aware 2007. To do this:
* Open explorer and navigate to the file. The file is usually stored in "C:\Documents and Settings\All Users\Application Data\Lavasoft\Ad-Aware 2007.? If you cannot find the folder please set your explorer to show hidden files. (To do this: open explorer, go to the "Tools" menu and click "Folder Options." Select the "View" tab and choose "Show Hidden Files" under "Hidden Files and Folders".)
* The file to remove is called "settings.aaw". Please be sure not to delete any other files.
* Restart your computer. Ad-Aware will start as normal.
Abre el explorador de Windows y ve a C:\Documents and Settings\All Users\Application Data\Lavasoft\Ad-Aware 2007. Se trata de encontrar un archivo llamado settings.aaw. Si no lo ves, en la pestaña Ver marca "Mostrar archivos ocultos". Vorra el archivo settings.aaw (y no optro! y reinicia el ordenador.
Alternativamente, me figuro que bastaría con eliminar ad-aware y volverlo a instalar, en su última versión.
Saludos.