You should start your PC in windows safe mode and let Avast scan your drive again. Now it should be able to delete/move the mentioned files, remember the filenames!. Afterwards you should search your registry for the filenames and delete the references to them.
Some infos to “your” Virus:
http://www.virusbtn.com/resources/vgrep/vgrep.cgi?terms=Hawawi-f&product=1

(edit: modified link)