Why can't I print screen grabs?

Episode 1722 (2:01:25)

Mike from Rancho Mirage, CA
IrfanView

Mike has been watching videos on youtube and wants to screen grab various shots. But when he does, it's terribly pixelated, like a multi-generational copy. And Windows just gives him an error. Leo says to open the file with a photo editor and see if it's better. Leo recommends Irfanview. Leo also recommends trying to make a PDF of the image and then printing that. It could be a print driver issue.