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.Win32.BHO.ah installs a component called Browser Helper Object (BHO).
Technical details (How to remove Adware.Win32.BHO.ah(pop up))