I recently got rid of a virus on my computer by wiping my hard drive clean. When I reinstalled my OS (Windows XP) though, I discovered I had no sound. The speaker that is usually on corner of the task bar is not there. When I tried to adjust the volume from the start menu, an error comes up saying that I am missing mixer devices. Nothing I have tried has worked as far as going to control panel->from there to device manager. Can anybody help me out?