I recently upgraded from vista home premium 64bit to windows 7 home premium 64bit, and ever since I did the upgrade my internet connection keeps dropping while I am browsing the web. It most often occurs when watching video clips but it also happens when im just browsing. I get the yellow triangle in the network status box and it says limited or no connectivity. After running windows network diagnostics my connection is restored and it is always the same problem, it says that the default gateway is not available, and it is able to fix the problem. I do have the computer hooked up to a router. I have never had this problem with vista and my laptop running xp is not having problems, so this points to windows 7 being the culprit.