I'm touching wood here, but I've never had a problem with viruses in my laptop. I don't ever click on this Spam stuff (tempted as I am to have a look at this Hot Russian Lady who's always on offer. Perhaps she needs air-conditioning?).
I'm very jealous of my sister, as she often gets men with strong Nigerian accents ringing her up to tell her about a serious problem with her computer. She's not ex-directory, so they can get her number quite easily. She has a bit of fun playing them along before she tells them to ...er... 'go away'. We're ex-directory and on the Telephone Preference List, so we get no fun at all. I'd rather like a nice chat with a Nigerian!
I sometimes wonder though just how much information is available about me on the internet, as I recently paid off a small loan, and instantly got lots of Spam about loans and strange credit card companies I'd never heard of. It was obvious 'they' knew!