Router. I have a Dlink DIR-615 wireless router. Everything will be working fine on my laptop and

Question

I have a Dlink DIR-615 wireless router. Everything will be working fine on my laptop and then I'll click on Mozilla or Explorer to search for something on the Internet and the page reads "server not found." At the same time I can still use Skype to make calls from my laptop and I can still send and receive email through Outlook. Other times I loose all connections to the Internet - no Skype, no email, no search engines.To reconnect I have to unplug the wireless router, disable the wireless on my laptop, wait a minute, plug the wireless router back in, wait another minute and enable the wireless on my laptop. Kind of defeats the purpose of having wireless... Any suggestions?