I do not know how this happened, or why. I was on the internet just browsing around for research for my class and then i shut down the computer and went to bed. Woke up the next morning, started up my computer and there is an open blank window that will not go away. I cannot seem to find it in my programs list, but it always shows on my taskbar as a yellow "F" with a blue background. Ive done virus scans and all that, but nothing shows up. I do not know what to do. If anyone could please help me, that would be great. When i right click it says close window, pin to task bar or smalldownloadmanager application. But every option i click does absolutely nothing. PLEASE HELP!!!