I cant use ITUNES on my PC because i always get this error message -1009

I cannot seem to figure out what the problem is on my PC, but the error says Itunes cannot connect to the internet becasue there is no internet connection, however everthing is connected. I cant access my account, or itunes match, etc. this happened with the last version of itunes i had also. i cleaned out the previous version and started fresh, but no good. none of the HELP tutorials have made any good suggestions. HELP!!?