Help with connection for steam update

Hi all, i have been trying to connect to steam server for an update for the past 2 days. The message shown is steam is temporarily unavaliable. I have went through the steam websites with regards to connecting via a firewall.

By the way I am using NIS 2010 v17.7.0.12.  Running on windows 7 home premium. I have already allowed NIS firewall to recognize steam.exe as not a threat. So I hope that someone in the community is able to help me with my steam client with regards to NIS2010. currently i am using a wired broadband at home. so i don think there is another firewall except the one in NIS 2010. thanks