I suscribe to Skype Premium. During a video call with one or multiple Skype contacts my laptop locks up/freezes and I have to reboot my laptop. This occurs at different in intervals during during the video call. My operating system isWindows 7 Ultimate and I generally use Mozilla/Firefox as my preferred browser. The lock up seems to occur more frequently if I have Firefox open but can occur with no browser open. I also have a high speed internet connection. Are there known conflicts with browsers or other applications that may be open in the system tray? Help.....this is very frustrating!