The UK has the highest rate of machines infected with spyware out of Europe. This is quite embarassing, considering most high profile anti-spyware campaigns have been centered in Britain. If you look at the rate of infection, you'll find that the annual spread is increasing at a dramatic rate and that this is just the beggining of spyware. It's up to people like you and me to prevent spyware, but even with our best efforts of warning our friends, I know several of mine who've been infected, but say they don't care. I wonder if they'd care if sypware got their parents online banking details and posted them on the net? That might change their point of view.
Awareness is the key though. You need to alert your family and friends of the seriousness of sypware and the impact it can have on their lives. There are plenty of stories on the web you can tell them about people's bank details that might scare them into taking more care into whichc pages they visit, and what they download.