Do a spyware and virus scan. If that doesn't fix it, try a system restore. If that doesn't, i'd reccomend (though i hate to do this, and try not to) that you back up all your data and reinstall. I don't know if what you've got is salvagable, but i'd say it might be more trouble than it's worth. And messing with .dll files can have unintended consequences...
Bookmarks