Some images are too big

Hello -- Some images I have captured, via SnagIt, have come into Rise 360 way too big (and blurry).  I've tried reducing image size; tried copying and pasting image in a PowerPoint slide and saving image of that image; tried saving it as a PNG file; played with the aspect ratio and DPI settings ... Our application logo is comes in way too big as well and is blurry.  Any other tips?  Thank you.