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.
Trojan.Small.AL is a Trojan designed to infiltrate your machine and open a conduit through which hundreds of adware and spyware can be downloaded and installed onto your system. Trojan.Small.AL opens up a huge 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 Trojan.Small.AL will also generate large numbers of popup adverts.
Technical details (How to remove Trojan.Small.AL(pop up))