File sharing is a form of online collaboration and exchange that is experiencing tremendous growth and interest. As long as users are aware of privacy, anonymity and other critical issues related to P2P file sharing tools and know the techniques and tools to manage those issues and control their effects, there is nothing to worry about. Unfortunately that is not always the case. Seven of the nine most popular P2P tools, downloaded by more than 320.000.000 users, come with so-called spyware or adware, insidious software which tracks user behavior and browsing preferences. Spyware employs a user's Internet connection in the background without her/his knowledge or explicit permission. Some spyware is able to pick up e-mail addresses, passwords or credit card numbers. Moreover, spyware can make the user's computer very slow and might even cause system crashes, since it uses memory and system resources and consumes bandwidth for sending information back to the spyware author. However, the real issue is not spyware but unethical companies that install ancillary software without adequate disclosure to their users. This Guide throws light on current privacy risks in music and file sharing. Actions of spyware are explained and infected P2P tools are identified and listed. The guide provides useful information about tools and techniques to avoid being monitored and tracked by anyone and practical advice on how to get rid of malicious spyware.