Harry now has a computer in his room

[heidi]

It's my dad's old office one, and it runs Win 2000 (although I may update it to XP if I can find my old disk) . He's about to turn seven, and a good reader, but his computer isn't connected to the internet as a regular rule, although I have a pcmcia card so I can do it once a week for updates and stuff.

What games & software are good for his age group? He's used my computer to play online stuff a lot, under my supervision, so we haven't looked into software for a while. I'm thinking games, sciencey things, educational-stuff-that-doesn't-seem-educational, etc.

Any good recs?