How to zoom in on a photo taken with nikon D3000 after uploading to my computer?

I recently bought a Nikon D3000 camera and love it. I'm having some trouble figuring out how to zoom in on an image once i plug the camera into my pc. While using the camera, i know how to zoom in on the screen but once i plug it in and upload to my pc, the photo is back to standard setting and i can't seem to figure out how to zoom in on it again once its on my comp. Can anyone help?

This is entirely a function of whatever software you're using on the computer to view the image.
How you "zoom in" will vary from software program to software program.
When you're viewing an image on your PC, look for a "Help" menu option, or press F1 -- that should explain it to you.