Shoutbox

I d/l messenger plus 2 nights ago and after I installed it I had some search bar that I could not removed.  I ended up restoring my pc to get rid of it.  I have plus on another pc without having that problem.  I would like to put it on this pc, but now I'm afraid to install.  I have a friend who has the same search bar that seems to be associated with plus.  Have you heard of others with this problem?  Where can I get a d/l that will not install such a highjacker?

Thanks