Look for free program called IrfanView. It does wonders. It is safe, I have used it for years. It converts from almost anything to almost anything.
Ilike it especially if I want a copy of a piece of my current screen.
Hit PrtScrn-Key (That puts the screen on your computer's internal copy-file)
Launch IrfanView, key CTRT-V (that pastes the internal copy-file)
With your mouse swipe from upper-left to lower right to define the area you want.
Launch IrfanView again, key CTRT-V, and there you are.