Comment Wipe out XP first (Score 1) 742
use a Netbook Linux version. There's plenty in e.g. Edubuntu and the Game repository that points towards early math and early reading. Sugar as UI might be worth a try.
And yes - be certain on the websites you allow. Less so about seeing people like god made them, but more about things people do to each other not covered by the 10 commandments (there's nothing in there prohibiting looking at a paradise suit, but a lot against violence).