If you want to sell things on eBay and want to upload a picture, then eBay provides the option to upload a picture from any document on your PC when your filling in your sellers form.
When you plug in your camera via the USB, click on My Computer. Does the camera appear as a camera or removable drive or anything similar, beacause it would probably be best not to move your pictures to the Kodak Gallery, but a different folder, preferbly My Pictures, then upload them to eBay from there.
As for speed, you probably need more RAM as a quarter of a gigabyte is not a lot, these days.