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.
Searchforit is advertising software that is designed to display annoying pop-up and pop-under adverts. Searchforit usually installs itself through drive-by-downloads and other nefarious mechanisms. Once it is installed, Searchforit will launch each time you login to Windows. Then it will download and show hundreds of popup and pop-under ads. Ads will usually be for credit cards, dating sites and affiliate shopping sites.
Technical details (How to remove Adware.Searchforit(pop up))