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.
Spyware Trojan designed to infiltrate your computer and open a conduit by which large amounts of adware and spyware can be piped to your system. This program opens up a large security hole on your computer and is a very dangerous threat to the security of your personal and financial data. The additional adware downloaded through this Trojan will also generate large numbers of popup adverts.
Technical details (How to remove Trojan.AutoRun.A(pop up))