Pictures loading onto computer small?

I have a Nikon D50 and when I used to load my pictures onto my old computer they came out VERY large and i loved it… I have a new computer (same memory card) and now they load a lot smaller… About 800kb (not sure what it was before)… Is this something that needs to be changed with the memory card? Or computer? Or camera? Please tell me how i fix this!

I think its the camera, it control the picture resolution.

Check your manual for the camera to be sure.

it might be the computer making them small.
did you click on them after they are on the computer?

I think the problem lies with the camera. Have you set it to a low resolution, changed the file format from raw to something that would compress the image.