Ideas On How To Get Rid Of Grey Scale Box On Photo File

A greyscale box appears only in FAA on my files (seems when I use the paint brush in GIMP). I tried cropping it off (placing crop around boundaries) that didn't work. Is there a way to work around this box? It's probably malware on my computer, although it only shows up on FAA. I haven't bought much needed file storage yet so I can put a new Windows7 on my laptop).

Double Post