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.
Security Toolbar 7.1 is toolbar program that claims to remove spyware. Even though the machine is clean, it reports the presence of spyware to convince the user into buying the full version.
Technical details (How to remove Security Toolbar(pop up))