my sound device

today i get my computer back from a store (fuckin' lightning struck into it) and it works fine, all previous folders and programs are still on , but i cannot hear any sound. it usually says like "Windows Media Player cannot play the file because there is a problem with your sound device. There may not be a sound device installed on your computer, it may be in use by another program, or it may not be functioning properly.". i just cannot hear any sound from my computer, either if i turn on speakers or headset. plz help . and this is like when i go to the command board. -->http://shrani.si/f/n/h1/37LnTPEW/aeaeaeaq.jpg . sorry for my bad english. i hope you can help me. thanks in advance , sppA