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.ActivShop is an adware application designed to "help" computer users with online shopping. Adware.ActivShop loads with Internet Explorer and has the ability to update itself without your consent and authorization. Adware.ActivShop will also record your browsing habits and send this information to its creators. Adware.ActivShop will also display large amounts of extremely insistent pop-up advertisements.
Technical details (How to remove Adware.ActivShop(pop up))