When you go to get one you can choose between a free or a paid version as your two options with a number of companies producing programs. However before you decide look to see what you get with each version and compare the two.
You have to remember that new spyware is being released all the time so you need to know how often your program shall be updated with the new threats. It has to be kept up to date or it may say your computer is clear but new spyware is stealing your information. Ideally it should be able to be set up and update automatically.
It is a good idea to also see what professionals and customers are saying about programs. They often recommend ones you should get so read what they say to get an honest opinion and not the sales pitch from the developers. It is much better to get this unbiased point of view.
You need to know how effective it is as a program and also how easy it is to use. These are the two main things to look for and in an ideal situation you should be able to have it running without it annoying you or using up too much of your computer.
So to sum things up you should consider the paid or free options available. Free covers most things but the paid can have things added to it as extras. Check how often they are updated and keep to the latest version. Check reviews from different places and look for the most effective yet cheapest. I am glad that all the spyware on my computer are all gone now all thanks to high quality anti-adware software which you can find out more about at my website link below.