I have firefox and was having that Java update plugin needs to be updated for about a week, only when coming to this site. I googled it and it said it was a virus but my Spyware, antivirus and Malware products didn't pick it up. The only way I could get rid of it was to clear the cache, so I did that for both my firefox and IE and "touch wood" haven't had the pop-up since. Of course you lose all your automatic type fill in and passwords so hopefully you have them written down before you clear the cache.