So your problem is that the computer downloads everything in your camera at one go ? What camera ? What software is used to download the pictures ? There must be guide lines for doing what you want to do.
You can always get a card reader,(assuming your camera has a memory card) then it will be like an external drive - do what you like with the picture files.
I usually have a lot of pics of my digital camera. I hook it up (XP Pro), and the wizard runs. I select a bunch I want to name Birthday and put in a folder named Birthday. Pics are downloaded, all ok.
Now, is there any way, without exiting the wizard, unplugging the camera, and starting all over, to go back and select a 2nd bunch of pics to give a different name and put in a different folder?
I know I could just download them all at once, then move them to separate folders, and then do a batch rename on each bunch, but that process sure gets tiresome.