DirectX 9c is also for Windows 7 and is fully supported.
The DirectX 9.0c download will update the DirectX 9.0c components and drivers already present on your system.
Look at the supported OS's. I've used this update myself numerous times.
Trust me when I say this will update your DirectX components and drivers which COULD in turn correct this very specific issue you are having. It's best to be up to date anyways.
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www.microsoft.com/downlo ··· ylang=en