matlab wont play the sound

i've got a matlab code that load a wav audio file and play some special part of it. it used to play sound on my pc but now there is no sound. algorithm works properly and show chunks and so on but it doesn't play any sound now. i examine it on my laptop and it works right and play sound. i dono what to do? the only thing that i've done and may be it caused the problem is that, i had got two versions of matlab on my pc:matlab 7.1 and matlab r2013a(8.1), i've deleted matlab 7.1,did it really cause the problem? does any one know how to solve the problem?

[Azzi Abdelmalek]

post your code

[mahsa]

here is the code: http://www.mathworks.com/matlabcentral/fx_files/28826/1/silenceRemoval.zip