How do you format a 2.0 GB SanDisk to download the pictures from it.?

You don't. If you do format it you will delete everything on it, including your pictures. I am assuming you have a USB-memory with pictures from a camera? If this is the case the pictures are saved in a lossless format and are usually not viewable by basic programs like Paint etc.

Either way: Attach the memory stick to your computer. Go to "My computer" and then into the memory stick. If it does not appear there you may need to refresh the window and wait for the computer to find the memory or install the drivers for the memory so that the computer can see and access it. Once accessed you should find files and or folders. Find out where the pictures are, can be one large file containing several pictures. google the file extension to find out what software you can use to access the file.