I get a problem with the USB device when I attempt to download photos from my D40 to my computer. How do I solve this?

ALTERNATE WAY TO TRANSFER PHOTOS AND VIDEOS TO A COMPUTER
If your photos and videos are stored on the memory card, then remove the memory card from the camera and insert it into an USB memory card reader. Connect this USB memory card reader and memory card into the USB port of your working computer. Your computer will see this as an USB Mass Storage Device or an external storage device; you can then open the folder on the memory card and copy the photos to your computer. Memory card reader is a handy device and is inexpensive. You can copy photos from other cameras and you can also download photos off your memory card to someone else's computer without the need of installing any programs.
The quickest way to erase the memory card. Go to the camera's Menu and scroll through the settings to Format memory card then format the memory card.

ALTERNATE WAY TO TRANSFER PHOTOS TO COMPUTER
If your photos are stored on the memory card, then remove the memory card from the camera and insert it into an USB memory card reader. Connect this USB memory card reader and memory card into the USB port of your working computer. Your computer will see this as an USB Mass Storage Device or an external storage device; you can then open the folder on the memory card and copy the photos to your computer. Memory card reader is a handy device and is inexpensive. You can copy photos from other cameras and you can also download photos off your memory card to someone else's computer without the need of installing any programs.

ALTERNATE WAY TO TRANSFER PHOTOS TO COMPUTER
If your photos are stored on the memory card, then remove the memory card from the camera and insert it into an USB memory card reader. Connect this USB memory card reader and memory card into the USB port of your working computer. Your computer will see this as an USB Mass Storage Device or an external storage device; you can then open the folder on the memory card and copy the photos to your computer. Memory card reader is a handy device and is inexpensive. You can copy photos from other cameras and you can also download photos off your memory card to someone else's computer without the need of installing any programs.

ALTERNATE WAY TO TRANSFER PHOTOS TO COMPUTER
If your photos are stored on the memory card, then remove the memory card from the camera and insert it into an USB memory card reader. Connect this USB memory card reader and memory card into the USB port of your working computer. Your computer will see this as an USB Mass Storage Device or an external storage device; you can then open the folder on the memory card and copy the photos to your computer. Memory card reader is a handy device and is inexpensive. You can copy photos from other cameras and you can also download photos off your memory card to someone else's computer without the need of installing any programs.

ALTERNATE WAY TO TRANSFER PHOTOS TO COMPUTER
If your photos are stored on the memory card, then remove the memory card from the camera and insert it into an USB memory card reader. Connect this USB memory card reader and memory card into the USB port of your working computer. Your computer will see this as an USB Mass Storage Device or an external storage device; you can then open the folder on the memory card and copy the photos to your computer. Memory card reader is a handy device and is inexpensive. You can copy photos from other cameras and you can also download photos off your memory card to someone else's computer without the need of installing any programs.

TRANSFERRING PHOTOS TO COMPUTER
If your photos are stored on the memory card, then removethe memory card from the camera and insert it into an USB memory card reader.Connect this USB memory card reader and memory card into the USB port of yourworking computer. Your computer will see this as an USB Mass Storage Device oran external storage device; you can then open the folder on the memory card andcopy the photos to your computer.Memory card reader is a handy device and is inexpensive. Youcan copy photos from other cameras and you can also download photos off yourmemory card to someone else's computer without the need of installing anyprograms.

Get a card reader and see if you get the same response.

It might have just happend due to recent update of your system

so the solution would also be another update

but before that go to the device manager , locate other devices and right click on it and click on update drivers, restart the system, if that works its fine else go on to the following link and download the latest version of the Nikon Software

http://support.nikonusa.com/app/answers/detail/a_id/61/kw/61/r_id/116678#Anchor-8

I had the same problem with my D40x - I changed my USB cable to a much more robust one and all my problems went away.
You shouldn't need a driver, most OS's will recognise it as an imaging device.

Yup! Absolutely, you can download photos from your computer to your phone by using a
USB Datacable that is compatible for your phone,a Bluetooth Dongle/adapter and or also a USB infrared Adapter...Click the links to see the images of each device...that's it, u can download your photos now...enjoy!

Those 3 devices I've mention can be purchased from cellphone retailers, computer spare parts store and even online if you want. I hope I had solved your problem..and if i did, pls rate this solution and it will be much appreciated, thank you!

For further questions, don;t hesitate to post it here.........good luck!