Network Shield blocked access to malicious site download.newnext.me/spark.bin?rn

Avast! On -Access Scanner Message
Network shield: blocked access to malicious site download.newnext.me/spark.bin?rnd

I am getting this message coming in every few seconds as soon as I log on to Wi-Fi server, without even logging on to the internet
what does it mean?
what can I do to stop it?
is the pc infected, so that I need to have it cleaned or wiped before using it ? scans are not coming up with infected files, but there are several files which avast! virus cleaning tool seems to be unable to scan, such as temp internet files, or stored favourite web pages etc
am I right that this program / site is trying to access store passwords, log-ins, personal and other vital details (e.g. credit card or other bank details?
grateful for any answers

thanks a lot

http://forum.avast.com/index.php?topic=53253.0