A family of Microsoft word processing software products for creating web, email, and print documents.
Choosing the "In line with text" option as Stefan suggests is best, because it's more stable than any of the "floating" options. However, if your design calls for wrapping text around the image, one of the floating options is required. In that case, if you just don't want to see the anchor, go to File > Options > Display and clear the check box for "Object anchors".
If you have trouble with floating images moving to the wrong place on the page, though, it's often important for troubleshooting to be able to see which text paragraph contains the anchor location.