paste the screen print to wordpad
ok ... when you do your screen print, hold down the 'alt' key.
this will take a shot of the active window and all the other desktop stuff won't be included.
umm ... so you held down the alt key and pressed the print screen key to place the screen shot on to the clipboard.
now you can open paint.exe and do a paste (ctrl V) to place the screen shoot into paint.exe. now you should be able to save the screen shot as a jpg, png, bmp, tiff ... any format by doing file>save as and selecting the 'save as type' drop down to select the format you want.