Another great report from PC Magazine read the whole thing here: Special Report from PC Magazine:
By Michael J. Steinhart
How security-savvy are you? Many users simply aren’t. Your machine may have come with an antivirus program preinstalled, but is the subscription up to date? Are you running a firewall of any kind? Are you conducting regular spyware and adware scans?
Or do you not mind hackers and unscrupulous marketers mining your PC for personal data?