What is an Adware ?

Adware is similar to Spyware, a malicious software/programs installed into your computer without prior notice.
It happens when you install a software contains an adware, downloaded some files such as free games, free software, free music, ringtone, videos and more. An adware can also installed into your computer together with a free software that you previously installed.

These malware is rapidly growing and infecting many computers from around the world.
Compared to a spyware, an adware is harmless. It only generates popup banners and advertisements on your computer.
Although it is harmless, but for some people it is annoying.

How to prevent an adware ?
Avoid downloading softwares from untrusted sites, avoid downloading games, videos, musics from an untrusted vendors.
Read the user agreement when installing software, particularly a free software.

Cleaning up your computer from an adware.
First, you need to have an anti-adware programs. You may download from many trusted vendors such as AVG Technolgoies, Kaspersky, Symantec, and many more.
Second, install the software by following the installation wizard. Third, perform a complete scan on your computer.

After all the steps above completed, you need to recheck the security level on your computer. It should at least set into medium level to protect your computer from unwanted downloads.