I'm going to assume you're talking about Dance Dance Revolution. Though I could be mistaken. Anyway, there are a bunch of games available for the PS1 and PS2, as well as 2 for the XBox. If you want the "free" version for PC, then get StepMania. It's pretty much just like DDR, except it has more option, and it isn't from Bemani.
You'll have to find songs on your own though. Check the forums at www.ddrfreak.com for info on finding songs. I've read www.ddruk.com has some, but I've never looked too hard, as I prefer to play on my consoles.
Downloaded it, and cant even play, it says it's a music select page, but looks more like a save game page... and it won't let me move on. No songs are installed, and I have looked everywhere and cant find jack... ARG
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www.stepmania.com
You'll have to find songs on your own though. Check the forums at www.ddrfreak.com for info on finding songs. I've read www.ddruk.com has some, but I've never looked too hard, as I prefer to play on my consoles.