Same thing! Last week, I could connect my EOS XTI without a problem. Vista did an update last night. All of a sudden, the computer doesn't even recognize the camera being hooked up! HELP!

You should not have any problems.
ALTERNATE WAY TO TRANSFER 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.

Hello
Wow youve done almost everything here.How about the firewall? is it blocking any connections?

Next,Go to control panel,network and sharing center.Look and see if the pc or laptop in question is on the same network,meaning home or public.

Set all your machines to the same network.Either home or public.I do know this has been a win 7 problem.

Manuals for the camera and all software supplied is here:

http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=DownloadDetailTabAct&fcategoryid=314&modelid=14256

The manual for the camera itself is the last one listed, titled:
"EOS DIGITAL REBEL XTi / EOS 400D DIGITAL Instruction Manual "

Vista is your problem. Solution...buy an inexpensive card reader to download your pics to a folder you create on your desktop. From there, you can send the pics to your photo editing software.

Try a different lens just to check out the lens focus sensor. or put it in manual focus.

You need to go to software.canon-europe.com. and download new drivers for vista. They have updates for everything you need.
Brian/Ireland

I had the same message on my EOS/Rebel XTI and the camera shop concluded that one of the pins where the card is inserted into the camera had come loose. They sent the camera back to Canon for repair. Luckily, it was still under warranty at the time.

Chris

Try manually add the network. If the problems continue, I would turn the laptop in for repair/replacement (if it under warranty).

Canon Vista compatible software now available ...with added support for some cameras, but not older ones. Go here: http://www.usa.canon.com/consumer/controller?act=DownloadIndexAct and navigate to your camera model and select "Drivers/Software" link. RAW Codec for Vista and updates to Zoombrowzer and DPP are available for the following: EOS-1Ds Mark II, EOS-1D Mark III, EOS-1D Mark II N, EOS-1D Mark II, EOS 5D, EOS 30D, EOS 20D, EOS 400D DIGITAL, EOS DIGITAL REBEL XTi, EOS Kiss Digital X, EOS 350D DIGITAL, EOS DIGITAL REBEL XT, EOS Kiss Digital N

I found the answer and fixed my flash. Look on http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00ODWf

This will describe how, if you have been using a speedlite alot, than the little tab under the shutter release side of the hot shoe can get bent down thus constantly pressing down (toward the bottom of the camera) the small button which deactivates the pop-up flash even when the speedlite is not attached. Just bend the tab up a little with a jewler's screwdriver, turn the camera off and on and voila!! Fixed!!! Dan describes pushing the tab down, but on the xti, the tab needs to be bent up to release the flash deactivation switch and fix the problem. Thanks to Dan D on photonet for saving me a service call.