Hyde an specific Widget

What`s up guys!

Guys, I need some help in a problem. I’ve been making an intranet site using multisite, the main-blog is visible to everyone and seach engines but the “Client Area” i visible just to admin and users, and it`s not indexed to any search engine, so… The matter is that the theme I’ve been using has a really nice Overlay Widget that falls from the top of the blog, and I want this widget visible only to admin, user never can see that!

Is there a way to do that?