I have a rather odd problem with my new NIS 2011. Every time I view YouTube videos for more than 5 minutes, when I log off of YouTube a minute later the NIS icon in the taskbar disappears, and so does the ccsvchst (administrator) process. This is sometimes accompanied by error 8504, 104. It is usually solved by logging off and on again. Occasionally I need to reboot to get NIS working again. This never happened with NIS 2009, and doesn't happen with my other 2 computers with NIS 2011, and Windows XP, SP3. Is this a problem with Flash player, or what could it be?