[davidgerard]

A Mac. If you live with him, Ubuntu.

If there's that Just One Piece of Windows software he needs, do try it in Wine - Wine works more often than not these days.

I never did viscerally understand how literally 25% of Windows XP installations could be botnet members until I saw my sister's computer in 2010. Oh my goodness. The disk was full because they never emptied the rubbish bin. And I don't think there's ever been a piece of crapware that my brother-in-law didn't download to try. The only thing saving them was that they were still on dialup. They're on broadband now (it turns out the killer use case for videophones is our mother Skypeing her grandchildren), and I shudder to think what it's like. Normal people do not use computers like we do.