Browser connection problem?

My laptop recently started giving me trouble with my browser, my internet connection is fine but when I open my browser it displays cannnot display this webpage so in order to connect I have to close the browser, go to internet options, connections, LAN, then unclick the proxy setting box and click the detect automatic settings, then reopen my browser and it works as long as i dont open a new browser later or close out the one(s) I have open, then it reverts back to those settings..I know it has to do with the proxy server but I have no clue how to fix it or even where to begin. Please Help! Thank you!