You can use windows movie maker's narration feature. Import any image. Click show timeline. Put an image into the timeline expand it to whatever length you need. Start a narration recording with the appropriate input selected and, stop when done. This prompts you to save. You can just close out movie maker at this point or, cut out any additional bits by clicking to that point on the audio track and selecting split. Right click on the part you want deleted. Select delete. Then move the audio track to the beggining. Delete the image you used from the timeline. Save the resulting audio. Oh yeah narration feature is the mic icon.