Well we can keep guessing or you can post your setup. If nothing will react it could be as simple as a permission problem on your computers account, or maybe some sort of surveillance tool, firewall, antivirus, spyware app etc. etc.

Did it work before?
if so, when?
Have you upgraded something Limewire/java in the meantime?
Have you changed something else?
Do you even have administrator rights on your computer?
Does your computer have other accounts and do they work as intended?

The more info you post, the more likely it is, that someone might be able to help.

Hi. Im new here and was searching for this question. I have downloaded my first movie file ****************

and the Limewire Media PLayer wont play it. So I downloaded VLC but it still says it cannot play. Does Limewire automatically choose its own Media PLayer? And then what? How can i tell it to open with VLC??

Sleepless edit: Please read the forum rules. Discussing file types etc. is fine, but direct filenames is surely not. Consider this a warning