My sound device deasapered!

Hello,

my comp doesn't give me sound, i removed some programs and when i restarted my computer have no sound, it says me "Windows Media Player cannot play the file because there is a problem with your sound device. There might not be a sound device installed on your computer, it might be in use by another program, or it might not be functioning properly."
even in other programs doesn't have sound, what can i do? help me please