What led to the computer virus did not sound

We have a large number of Internet cafes recent computer suddenly did not sound, a small speaker icon in the lower right corner is not open, to be unloaded after the re-install the sound card drivers may be, the net off the normal tests, local area network believed to be caused by the virus, what is the virus and how to prevent! ! ! Ji Jiji

general, not specifically to attack the virus sound card.Just some kind of virus after the attack affected the sound card .So we can not say specifically what kind of virus.May be to choose “to delete infected files” involved in the sound card.To solve the problem completely, I am afraid to reload the system.How to prevent ~ ~ ~
the Internet to restore wizard It is not effective??
System to do it all again, and then restore the installation wizard to set up the system restore point best ~ ~ ~
, are you trying to