Thread moved, title amended. In addition to the link kimsland gave, it is probably beneficial if you read or at least skim the thread in my signature too.
Your "speakers" do not need a 3rd party driver. ie Restarting and it will come back
But "Audio" drivers are found at your manufacturer website, please check here: >>Driver links by manufacturer
Yeah I did the same thing last night. Just going thru and uninstalling programs I didn't need and next thing I know I have no sound! I'm new to this program here as well! Best of luck!