I've been getting an error (pic attached) in Windows Media Player when I try to play .mov files. I used to be able to play them in WMP but now I'm unable too. I can play them fine in Media Player Classic but I'd like to get them working in WMP as well. I followed the "Guide to using Codecs" pinned thread but had no luck fixing the issue. I uninstalled the "K-Lite Mega Codec Pack", cleaned my registry with "Regsupreme", installed the standalone "Quicktime Alternative 1.76 Final" tool and reinstalled the K-Lite Mega Codec Pack without QT Alternative. I even tried upgrading to WMP11. Still, no luck. Does anyone here have any other solutions?