How do I get my Dell Latitude D520 connected to the internet?

I have a Dell Latitude D520, it says its connected wireless and threw a Ethernet and it still doesn't load internet explorer. If you can help me out I would appreciate it greatly...How do I get my Dell Latitude D520 connected to the internet?seems your security software blocking access try uninstalling it , this happens most of times in norotn, mcafee, trend micro.