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Dont know what paint programs you have but this would be pretty easy to convert. For example I have Paint Shop Pro 6 & 9 and it would be easy to do in either one.

I would just open the gif with the animation viewer. Then select all images in it and open them in the Paint app. Since the image is black and white it makes it even easier, just pick negative image for each one. Save all the images. Then create a new gif with the saved images, with the same timings and sizes as the original. Save as gif and done.