At the worst-case scenario, spyware can collect passwords, usernames, and credit card information, and can even install additional software by secretly visiting websites with malicious code. 

The fact that spyware can open the proverbial floodgates for viruses, Trojans, and can be a primary means for identity theft makes spyware protection a prerequisite for every computer that will be made to connect to the internet. The number of totally free spyware removal tools available makes it easier and inexpensive, all that is required from the user is a little effort and the willingness to spend some time in protecting himself. One also needs to realize that the spyware’s contagious nature makes it so that every single computer that is infected increases the risk of infection for everyone, which means keeping his system spyware-free is the responsibility of every computer owner.