Hi.. I have Dell Vostro 3550 with 64 bit Windows 7.I have D-link DSL-2730U modem with router. I have wi-fi connectivity problem in my laptop from last 10 days. Wi-fi connectivity drops at every 2-3 minutes. LAN is working fine. I regularly update my windows. Wi-fi connection works well in "Safe mode with networking". So there is no problem in wi-fi card and modem with router. Even i tried to format my laptop and re-install it.Tried to uninstall antivirus. After reinstalling Windows 7 it works well for 1 or 2 days and again problem started. I read some question same like this of 12th november,2012 regarding same problem. There was written that updates have started creating problem. Even i also thinks like that. Mostly updates have started problem. Even after reinstalling windows 7 i installed updates for 2 days and after that i am getting problem again. Before installing some updates wi-fi was working well. Please help me out from this problem.

Perhaps there is a service that prevents WiFi from working properly. Try to disable unnecesary services (by one at the time) and analyze, which is responsible for it. Rgds Milos