can't setup avast !

my laptop had been atrack by viruts, i was setup avast free but it not access and 1 can’t go to site http://www.avast.com/index

Please start a new topic in Viruses & Worms (http://forum.avast.com/index.php?action=post;board=4.0) and attach your logs. (MBAM, OTL and aswMBR…!!)
Instructions: http://forum.avast.com/index.php?topic=53253.0