I seldom use Paint and I made a mistake in the last step.
Here we go.
You now have the area you want to crop. Right click in this area. A menu
will open, click on Copy (there is also Copy to, don't use this one). When
you click on Copy, the area selected is saved into the Window XP Clipboard.
Then, click on File, New. You may then get a message about saving changes to
the file displayed on your screen. Answer No if you get this message. After
you click on New a white blank space will take the place of the image
previously displayed (the white space may be smaller, don't worry about it).
Click on Edit and click on Paste. The cropped area of your image will now be
displayed on your screen. Click on File, click on Save as and give it a new
name. You can just add the word Crop to the name of the original file. Make
sure that you save the image as JPG as given in the file type box below the
box where you enter the name of the new file. You can then open this file
like any other photo file.
Nothing wrong with using Paint to crop. It is a way to get started and it
may be all you need. If you want to do more fancy types of cropping and work
more with images you may want to look into image imaging software more
advanced than Paint.