Running windows 7 on a e-machine desk top, 64 bit. Last fall downloaded a cat waging tail from Firefox list of add-ons and it worked properly until 2 weeks ago when the tail stopped. I uninstalled and reinstalled and it worked until the nex boot up when it stopped. I added a different add-on, cat with blinking eyes and it worked until next boot up. I uninstalled and reinstalled Flashplayer 11 and cat still fails to work. I have a cable modem through a cisco router and all connections working great. Thank you!