Problems connecting to new networks with windows 7

Whenever I connect to a new network with windows 7, It always takes ages for it to identify the network. Also the dns settings do not seem to always work right. In the case I usually use it, the wireless network I connect to wants to redirect me to a webpage for authentication, but that does not work because the networks dns settings are not loaded. Also I frequently have webpages failing to load in chrome, and it says check you dns settings. 

Help is much appreciated.