Thanks all for the tip on WSE, I'll install that on my netbook.
I agree with the sentiment of the past posters, though I think the message can be sent without being rude about it.

I switched to the Mac back in 2003 and since then I only use a PC rarely at home (my netbook) and at work (which is managed by IT and thus I don't -- I'm not allowed to -- look after the nitty-gritty maintenance).
When people ask me questions about PC support I can honestly say "sorry, I've never done that" or "I don't know how to do that". Now if it's truly important then sure I can spend some time Googling for help. Like a few weeks ago when I lent someone my USB stick and when I got it back there was a VBscript file sitting on it. I Googled it, discovered it was a virus, and sent him instructions on how to clean his computer.
Sometimes after I say "sorry, I don't know" I get asked "well, then, how do
you do it on
your computer?" This is when I get to beat my own drum,
subtly, by saying something like "Well, now that I use a Mac, I find that I never have that problem anymore." If you want any hope of this person trying a Mac in the future you want to avoid saying belittling things like, "Well, that's what you get for buying a PC, next time buy a Mac! hawhawhaw!"
(I had a friend who did exactly that all throughout high school. He had a Mac and was
damn proud of it. I had a PC and he was quick to laugh at
every shortcoming he could find, no matter how trivial (and even if his platform had the exact same shortcoming just disguised a little differently!) I can tell you that this attitude gave me absolutely
zero motivation to switch.)
A lot of Mac people seem to treat their computer choice like a religion, trying to evangelize and convert others. Which can be fine as long as you do it in a way that's not annoying. I don't think you'd be offended if I invited you to come to church with me, once. But if I start insisting, or if I get visibly irritated with you because you chose to go shopping instead of joining me at church... yeah, it's the same thing. Don't go there.