The other day my PC started beeping at me. Every "Are you sure?" message box was accompanied by a "beep". I don't know how or why this started...I only wanted to make it go away.
First check, Control Panel -> Sounds. I confirmed that I had my sound scheme set to "No Sounds", but the beep stubbornly refused to budge.
Next, Google. Did you know there's a "Beep" driver? Neither did I! The HowToGeek has a nice article on disabling this driver on XP, only issue is you have to be admin.
I rolled up my sleeves, ran an elevated command prompt using...