Hey. I'm new to the site but I've been checking it out alot for answers to most of my computer problems. I recently downloaded a codec pack called Ace Mega Codec Pack to play certain files I couldn't before. It didn't work and now some of the files that I always could play in WMP won't play at all, an error appears saying "An operation was attempted on a pin that doesn't exist in the DirectShow filter graph." They always played before. Anyone,what should I do?