“Spyware” is no longer simply a nuisance to enterprises. It is estimated that 90% of desktop PCs are infected with some form of “Spyware” (Source : US National Cyber Security Alliance). According to Gartner between 20 and 40% of enterprise help desk calls are now related to unwanted “Spyware” programs. The different types of “Spyware” present different risks to enterprises. Cookies raise privacy concerns but are relatively low risk. This article looks at the different types and discusses the measure enterprises can put in place to protect themselves.