PCMatic includes a registry cleaner/optimizer and such things can frequently cause more problems than they create.. All you really need to do is check the internet for ALL the reviews.. Payment and billing problems with PCPitstop...Installation problems... bloated features that aren't really needed and actually slow the computer down....and advertisements that aren't fully factual.

http://michaeljkarg.blogspot.com/2011/12/my-pc-matic-experience.html

http://www.complaintslist.com/computer-software/pc-matic/

And most importantly, YOU are the most important protection against security issues. ANY antivirus/protection program will miss something and your use of a hardened browser and safe surfing practices is better step in the right direction.

Hope this helps.

Grif