How do I unload my pictures from ipad3 to my computer?

Easily, you have to download iCloud, https://www.icloud.com/ and then install on your computer. Finally, set up a Photo Streaming on. iCloud Photo Streaming is work fine, enjoy it ^^.

Importing Personal Photos and videos from your iOS device to your computer.

http://support.apple.com/kb/HT4083

 Cheers, Tom 😉