Just hitting print screen won't work, you will get a black screen (it may work if you are in windowed mode, not sure though). You have to use secondary software.
Some of us are busy doing things; some of us are busy complaining - Debasish Mridha
The 1st link Richie61 supplied is for irfanview and it looks like alot of hoops to jump through to make it work. I have been using paint.net for years and had hoped there was a plugin for that which I could use.
The 2nd link I didn't see earlier, so I need to check that out.