PLZ check the shots…
http://postimg.org/image/bhu23kqc5/ is this a problem… and also when ever i try to scan a file its like http://postimg.org/image/t9p42bodj/ is there any solution… 
this forum section (Viruses and worms) is for reporting virus and false positive problems
have you tried avast repair?
controlpanel > ad/remove programs > avast > uninstall/change > repair option …wait a minute and reboot
no the problem still there… i tried most of things… like restore, registry clean up, uninstall & reinstall… not working…