You can leave the file it doesn't need to go back into the folder...
It's strange that VLC isn't giving out any audio on the file...Try installing one of these codec pacs and see how you go...
For XP this codec pac is very good
Download XP Codec Pack 2.0.8 - XP Codec Pack is one of the most complete codec pack
Or for Vista this pac
Vista Codec Package v4.6.4 (freeware)