You may have recently read about a malware problem that may have infected a number of computers.  If your computer is infected, you will lose internet service when the government discontinues their server operations on July 9 that were setup to deal with the malware.  The article, FBI: check for DNS Changer malware before it’s too late gives a brief history of the problem.  Simply open this link and in the third paragraph below the big FBI seal, the word here is in red.  A click on that red link will tell you immediately if your computer is OK or infected.