I have windows Vista. Just recently when i go into limewire and click on a song i want to hear it plays a totally different song. I have tried to delete and re-download it but it is still doing the samething. I also tried redownloading limewire and the problem is still there. Does anyone know how can this be fixed?

Are you using LW's player?
Have you tried using different players?
Does the same thing happen?
Are the different songs that play ones that you've downloaded before, or are they completely random?

If the same thing happens with multiple players, maybe you should update your AV & scan for viruses.
Have a look through this thread for more info about security programs: http://www.gnutellaforums.com/330543-post11.html