I downloaded the trial McAfee for 30 days. After the 30 I tried to uninstall it. McAfee wouldn't leave using the control panel add/remove feature, & it also took away my audio when I hit the remove button. I finally downloaded a program from Microsoft that took it away. Now my pc doesn't even have a speaker in the bottom rt corner. A scan says that I need the file "sthda.sys on Sigma Tel High Def Audio". Does anybody know what happened to my volume speaker in the corner, & where I can get this file for free? YouTube & Candy Crush are weird without audio.