I was trying to reinstall the AC3 filter but every time I try to do so I get an error saying "Error opening file for writing- AC3filter\ac3filter.ax"
http://www.mrbrownee70.com/ac3filter_1_11.exe
http://sourceforge.net/projects/ac3filter/
Both of these files give me the same error.

Make sure you close all windows and programs before trying to install.

what OS sytem do you have? these are for windows.

are you on XP, VISTA, MAC, LINUX, ETC. some system specs would also help us try to figure out why you get the error?

Cant close all windows now I'm downloading at he moment.
It wouldn't install in program files but it did install in it's own folder but it still won't play the audio.
After my download is done I'll close all windows and retry and also reboot.
Running XP Pro sp2

Thanks for the help

I reinstalled and rebooted and still no dialogue.
I've only had this prob with a few other movies and when I did I just chalked it up to bad encoding so now I'm really confused.

So when it finally installed properly it installed to "C:\Program Files\AC3Filter"? Are you using firefox or ie?

I'm downloading the movies and using the VLC player.

VLC can decode AC3 audio but it doesn't use the AC3filter to do so. It uses a52 decoder liba52. You will never get AC3filter configuration options in VLC. If you really insist on uses a player with built in codec support, use KMPlayer. You set it to use internal codecs (default) for everything, and then just set AC3 decoding to use AC3filter externally. Unlike VLC, KMP gives you a choice in what codecs to use rather than forcing you to use its internal junk.

You can find it in my sig if you wanna give it a try.

SEB - I was having problems getting sound for a particular video using VLC for playback. I downloaded the ac3filter codec. After installing it, I was able to get all the sound in VLC.
See my post HERE documenting this.

I'm not sure why it worked, only that it did. One of the installation instructions was to allow the ac3filter to reset other codecs on the computer to their default settings. I let it do that. Everything seems to be running fine now. Hope that sheds a little light on the situation.