What does acropdf.dll (Adobe PDF Reader, I think it's called an add-on) do ? It seems I have it currently enabled. I vaguely recall that I disabled an Acrobat add-on, possibly for security reasons. Perhaps I have inadvertently enabled it by 'cleaning' my computer. (cleaning=removing browser history and such) What are the consequences of enabling/disabling it ? My installation of Adobe's Acrobat Reader is not standard, I have removed it from the startup list by using Hijackthis. (I'm a minimalist ) I have a Windows XP Home Edition system.