Spyware are similar in that they are also freeware, however, spyware programs have embedded tracking programs which reports your activity in the internet to the spyware agent which in turn provides the information to advertisers and web developers. With this information, advertisers and web developers and even the government can feed your computers with any information they want without your consent and even without you noticing it.
It is best, therefore that you employ some precautionary measures yourselves to stay free from spyware and adware attacks. First you need to disable auto installation of software programs in your internet browsers and you need use pop-up blockers and firewall protection.
This is your first line of defense against such spyware programs. The next thing to do is to get decent anti-spyware programs. It shouldn’t be too hard, there are a lot of them nowadays and most of them are free or at the very least have free trial accounts.