Adware:Adware (or spyware) is a small program that is designed to show advertisements (in various form and degrees of intrusiveness) on your computer. It often reports personal information back to its owners. As a result your sense of privacy can be violated.
CouponBar is an adware application that installs into IE as a Browser Helper Object (BHO). Once installed, CouponBar creates a toolbar in Internet Explorer and will display numerous adverts and coupons, based on the websites that you are visiting. CouponBar is known to come bundled with other adware.
Technical details (How to remove CouponBarIE Toolbar(pop up))