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.
Apropos.bho is a browser helper object, variant of the PeopleOnPage software. Apropos Ads may be showed in a variety of formats including: -- Pop-Up or Pop-Under Windows which will appear as windows on top of or beneath other windows on the PC screen. -- Sliding Skyscraper Windows which will appear as sliding images showed over POP! content.
Technical details (How to remove Apropos.bho(pop up))