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.
Adware.BHO.cn is a nasty adware application that installs itself onto your web browser as a Browser Helper Object (BHO). Once executed, Adware.BHO.cn will attempt to connect to the Internet and exploit the infected computer for commercial gain by delivering unsolicited and irritating pop-up advertisements. Adware.BHO.cn may cause unstable performance of your browser.
Technical details (How to remove Adware.BHO.cn(pop up))