Adware is advertising supported software which displays ads on your system.
Spyware is software designed to track your computer usage.
Adware often takes the form of spyware, not only displaying advertisements, but also tracking your web surfing patterns. This information then can be sold to data warehouses, or organizations looking to market to you.
Even more insidious is the loathesome malware. Malware is software intended to interfere with other programs on your system. Malware can cause programs not to function properly, or even bring down your operating system if it infects certain files.
As if these bad programs were not sinister enough, some organizations market Malware as if it was designed to remove spyware from your system. An analogy might help: some malware is like a thug dressing up in a police uniform offering to protect you, then jumping you for your belonging. If you ever see a pop-up advertisement saying Your PC might be infected with.... scan your system now, or something along these lines, you're best to close your browser and stay away from the site marketing the software. If the ad appears again right after opening your browser, you might already have a form of adware/spyware/malware.
One of the best programs for dealing with adware/spyware/malware is Lavasoft USA's Adaware. Note the spelling in Ad-aware, which is different from Ad-ware (an extra a). I guess the idea behind the naming of Adaware is that the program is suppose to make you aware of adware/spyware/malware.
Once you've downloaded Adaware from the Lavasoft USA site (don't trust sites you don't know - they could contain spyware) you should scan your system.
Though there are a number of anti-spyware programs that claim to be able to protect your system from spyware, I've found the claims to either be overblown, the programs to actually be spyware/adware/malware, or poorly coded so as to slow down your system drastically.
I've done a couple of things to minimize spyware problems. The first thing I've done is to not use the Internet Explorer web browser except for internal (Working Centre sites) browsing. I use Mozilla Firefox 99.9% of the time. Firefox has some added benefits that I really love (code engines).
The next step I did was disable Java and Javascript in the Tools -> Options -> Web features.
Resources
- Adaware - anti-spyware tool. (C|Net download)
- Mozilla Firefox - My favourite web browser.