If you open PDF in free Adobe Reader X, you should be able to left click once on picture in PDF to select it, right click and choose "Copy Image". It will then be on your clipboard and you can paste it into Microsoft PowerPoint or Microsoft Paint, and then save it from these applications as a JPEG.
If this doesn't work, you can try ExportPDF, which will convert your PDF to Word, and from Word you can right click and choose Save Image As...).
Let us know if you have additional questions or issues.
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