I installed Windows 7 on my laptop; now it cannot connect to the internet on internet explorer, although it indicates that it is connected to my wireless network. Plugging in the ethernet cable doesn't give me a connection either. I am a complete novice and need absolute instructions on how to fix
I'm not sure if this is the same issue that I experienced with Vista at some point. Do you get the "Limited or No Connectivity" message? There is an issue with Vista/Windows 7 and certain old routers. I had an ancient linksys box that caused me all these issues.
In my case the solution was to do the following:
I had to drop mine to 10 Mb Full Duplex. It started working after that.
I wrote about this experience: Terminally Incoherent - Vista 64 Bit Limited Connectivity (Local Only).
Open a command window by htting windows+r and typing cmd, once there run ipconfig /all -- and post your results here. That should help us diagnose.