For days now, a "Reminder" box pops up on my screen every few minutes. It's followed by whatever the date is. It always says that a Web page cannot be opened and to try various things, even though I'm not online or trying to open any page. I can get rid of it by opening the task manager (control, alt, delete), but it comes back in a few minutes. I tried "System Restore" but that's not working, for an unrelated reason. I'd like to stop this annoying reminder. Thanks.