So I have this copy of Geometry Wars Retro Evolved. I played it on my computer running Windows XP. It had no warpy grid effects, and very limited particle effects. No special lighting or glow. I was a little dismayed, as I realized that the cool blue wavy grid effects and explosions I saw when I first played it were only available for DirectX 10, on Vista. So, I copied it over to my mom's vista computer. It looked more like this: (note the warping blue grid) Now, months past, I have since then reformated my HDD and reinstalled Windows XP on the first computer. I got a flash drive and copied the game back onto my first computer with XP. But what! The grid effects are there! Here's a screenshot: SO what is this? Is it bullshit that this game needs DX10 for those effects, and it really just disables itself on XP machines? Did I thus inadvertantly reenable the effects by running it on the vista machine? What is going on? This should not happen! I mean, it's awesome, but why?