There is a program that you accidentally downloaded that is doing that. I just fixed mine. I opened windows task manager, and looked at the list of processes that were running, and did a search for any that did not ring a bell. It was a bit of a pain, because the program that I deleted did not solve the problem, so I ended up looking for a file name and deleted the file. End of problem. I think that there should be public caning of people who write this crap.