You either have java switched off, or an olde

Hello,
Having recently updated my java & Adobe flash to player 10, also internet explorer 8 for windows xp, i can not view any videos on you tube, message i am getting is, either you have java switched off, or you have an old verion of flash player i have uninstalled, re-instaled, checked my norton firewall settings, also adobe settings used ccleaner, still no joy, i would greatly appreciate some help here as this has been ongoing for a week now, i have tried executable zip, worked briefly, then went to log back in you tube next day, no videos, just white background, never had problems before, my windows is xp home edition with 2007 office enterprise (2) all the latest critical microsoft updates have been installed.