please help ?

[Julia]

I haven't downloaded a thing and yet yesterday when i turned on my laptop I had a bing toolbar and ads popping up EVERYWHERE on every website I enter, adblock doesn't work either. It's not that my homepage have changed, I just have the goddamn toolbar and ads everywhere.
I can't find it in my computer when I go to the place where you remove programmes, It's just nowhere to be found and I can't remove it!
I use google chrome and have windows 7. Do I really have to reinstall chrome? I guess I will lose all my bookmarks and stuff in that case.. :/