Any software that covertly gathers user information through the user's Internet connection without his or her knowledge, usually for advertising purposes. Spyware applications are typically bundled as a hidden component of freeware or shareware programs that can be downloaded form the Internet. Once installed, the spyware monitors user activity on the Internet and transmits that information in the background to someone else.
Symptoms of spyware infections:
Slows PC performance
Unwanted pop-up windows
Free Spyware Scan
www.trendmicro.com/spyware-scan/
Browser home page repeatedly changed
New or uexpected toolbars in browser or programs
