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Have had no end of problems with Firefox lately not reading sites but that is old stuff. Last few days on anti virus downloaded Avast to try out and didnt install it I thought as declined the conditions as they said would sell me on to offers etc from other people and no way but then found it was installing, then tried to uninstall using Revo free, then Revo Pro trial and failed on both. Then looked at properties on the program files and under read clicked on secret as did not know what that meant but it meant I think disappear as it has. OOps. Anyway still hanging around on Firefox a tracking helper but not visual in usual places for add ons extns etc so thought uninstall and then reinstall an older version from my external HD so untainted - HA! Already have Mask me. So there we went along as usual to uninstall by Revo free which had Firefox 24 on its window and off it went, but all of a sudden up popped Firefox browser so waited to see and voila it is Firefox 25 in all its glory and still with the tracker of Avast on it. So had 2 versions ? New 25 didnt install over the old 24. And in Revo now since then not showing in window as Firefox 25 being on the computer nor in Ccleaner or on start<programs how odd. So this is working but not detected at all as being here. But then Thunderbird also showing older version not the updated latest.Means I had two versions of Firefox running and old version wasnt gone at all but why in that case is none of the usual places showing that FF25 is alive and sort of well as can be with Avast bits lurking in a secret location. Maybe I have more than one Thunderbird too as shows old one from August not latest. Help how to rid me of Avast and then solve the mystery of FF please. Why do I get these mysteries thought going to upgrade and Window & would stop the problems I have been having lately with XP. I have MSE runnging now as Anti Virus. No other showing on any either above so Avast is hidden too.