Maybe the tests concentrate on Spyware identification/removal, but miss out on other real-world issues... A free version is available - with reduced functionality. Ordinarily, to reduce unwanted SPAM, ads, messages, etc, you should ensure that the "Windows Messenger Service" is Disabled. Microsoft has KB articles on this subject, including this one, and this one.
Many traditional virus scanners, aside being not very effective at their own job, are particularly ill-suited to removing non-viral malicious software, also known as malware (are you having fun with all of these different classifications? Ad-Aware is one of the legitimate answers to this problem.The following suggestions have evolved over a few years, and are based on real experience of clearing infected PCs, attempts to formulate procedures which prevent infection, and reviewing excellent advice from many others in similar situations. Every day, new threats arise, or new tools are available, or some established tools are improved significantly or have become out-of-date.I'm using the term Spyware in a "general" sense - covering Trojans, Worms, Keyloggers, etc.My tests indicated that PP was very upset, and caused serious random re-boots. Update (based on personal experiences, and on general comments on the 'net): Version 4 was good, stable, etc. Webroot indicate that ver 5.0.7 (1608) has resolved the CPU usage issue, but it is still NOT recommended, IMO.But, I did not run exhaustive tests to establish who disliked whom. After installing, you should review the "options", and activate any which might be beneficial. Check these (especially this one), and install any that seem appropriate. Version 5 may have many extra features, etc, but does not run well (sometimes? The product is unstable: - Sometimes it loads correctly at boot, sometimes it does not.