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Actually it seems, this is depending on your PC hardware. I had the same problem, when trying to run openni_camera on a Pentium 4. On several newer computers Core 2 or Core i5 everything runs fine.

In any case, while the OpenNI stuff is compiled using only SSE2, the NITE libs seem to be compiled for newer CPUs (maybe using SSE3 instructions) and will cause "illegal instruction" errors on older machines.

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