Options for Win 98 Machine - Linux (which version?)

I have a Win 98 machine. It's an AMD 650mgz / 384 megs / 30 gig 7200 Hard drive. It cost over $3,000 back when I bought it way back in 1999. Anyway, lately I notice more and more programs no longer work with Win98. I'm thinking of coverting to Linux. This machine is primarily used by my kids to play Nick Jr. and PBS Kids games.

Anyone have any ideas on how to do convert to Linux? Which version to use? Is this a good Idea?