Windows Update may sometimes support updates to your video driver, go to Control Panel then into Windows Update and then check for updates. If windows doesn't find any updates for your video driver then find out who made your video card and what is the name of the card ( companys like Intel for example ) and go to there site and somewhere in their site should be a place where you can update drivers.
To find out what the driver is go to Control Panel then into Device Manager then check under Display adapters and that should be the driver. Double click it for more details or click on the Driver tab and click update driver.
If I'm correct you have an ATI Radeon X1300 graphics card (make sure by going start>run process>dxdiag, then in the display tab), which is perfectly fine for stepmania.
Download the lastest drivers here: http://ati.amd.com/support/driver.html
I think you can figure out from there.
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