What is something free I can download to take screenshots?

[n64]

I tried pressing print screen and then pasting the picture into paint but it is always a bitmap and I want it to be a Jpeg.

[deviantchild]

in Paint(tm) click on 'File' to access the drop-down menu
choose 'Save As...' (the fourth option down the list)
type in whatever 'File name:' you want
press the 'v' button on the r/hand side of the box marked 'Save as type:' and choose 'JPEG File Interchange Format (*.jpg,*.jpeg)' from the list

/me worries that he is being set up here ;)

[Nupraptor]

There's a little piece of freeware called Grabber2k Lite which should work just fine. I like it.