Gausian blur color artifacts

Can you please tell me why i get these horrible color artifacts when i use gausian blur... is there a way of blurring an image without them? is there something wrong with my computer? ...i blurred this image at 12 pixels gausian blur. the picture is zoomed at 800%

You're blurring the image so much that you're seeing the edges between values. This can be exaggerated by your document profile, display profile, and some (especially cheaper and laptop) displays.
In 16 bit/channel images, you can some see quantization because the display is only 8 bit, even though the data in the image doesn't actually have any visible steps.
It isn't an artifact - just a consequence of creating really smooth color gradations, and your eye is good at finding edges.
This is called "banding" or "quantization", and can be minimized by adding a small amount of noise back to the image.

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