My network problems, unable to connect to blogger or Google (a big problem!) was due to my Nintendo Wii wireless connection.
Previously we had network drop outs when the Wii was plugged in all the time but this was different.
After a few minutes of the Wii sitting on standby but allowed wireless access I couldn't connect to Google or other related site, YouTube, Blogger etc. All other sites worked OK.
After unplugging the Wii the problems have not re-occurred.
So, check out your Wii if you have network difficulties.