I have the latest DirectX and I run under WIndows XP so I use Rev X86. Maybe It's a bu of the last releases. I don't know if it means somehing buy I installed the new Internet Explorer recently.
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CPU Intel Core2 D E6700 2.7Ghz | 2 GB RAM DDR2 | GeForce 9800 GTX + | 320 GB Hard Drive Space | Windows XP Pro SP3