Assistance. after reinstalling windows i can not get any sound from the computer.i`v tried with

Question

after reinstalling windows i can not get any sound from the computer.i`v tried with the menus help but to no avail everything is conected right.i allowed a freind to reinstall windows for me and he wiped the drive before hand so i now have no volume in the system tray.and when i go to control pannal it is`nt even highlighted i know i`v lost all my programs such as power dvd and others