"Spyware infections prompted almost one million U.S. households to replace their computers in the first half of 2006."
-Consumer Reports, State of the Net 2006
Running out and buying a new PC every time the computer gets bogged down from spyware can be a very expensive proposition (and not necessary).
It goes on to say...
"The total loss from all cases of fraud referred to the FBI's Internet Crime Complaint Center in 2005 was $183.12 million, with an average loss of $424 per complaint. This is up from $68 million in total losses a year earlier."
-FBI IC3"
This is very important as I tell all of my clients who are reporting slow computers, to first check for spyware, as it is most likely the cause of many people's performance degradation problems.
It should be no surprise either that it is now something that should be a routine for PC users to run Anti-spyware software often or even daily, and there shouldn't be any excuse, as Lavasoft's "Ad-aware" software is free.