I assume you are using Ubuntu from the user agent icon in your post. It would be useful to know the make/model of your computer, also.
The crucial piece of information to get started, though, is the make and version of the wireless chipset. In a terminal, run the command lspci in a terminal (it stand for list pci devices), then post what it reports about your wireless back here; it is almost certain someone can help you.
Edit: Demuxer plugin for what precisely?
Last edited by frankbell; 05-23-2012 at 08:19 PM.