Windows – Problem importing pictures from a digital camera with Windows 7

Since I'm using Windows 7 (Beta, then RC, now RTM), I have issues when I download pictures from my digital cameras. It happens with my two cameras: a Canon Powershot S2 IS and a Canon Ixus 80 IS.

When I plug a camera (any of them) into a USB port and switch it on in Play mode, the Autoplay function of Windows 7 starts with this screen:

I select "Import pictures and videos" to call the native Windows 7 tool.
It searches a bit for pictures to download from the camera and starts the transfer.

However, during the transfer, I often get errors like this one:

The error message is "the following error occurred while importing xxxxxx.jpg", "the file or directory is corrupted and unreadable".

If I use "Try again", it works fine the second time and the picture is retrieved correctly. It's very annoying when it happens 20 or 30 times in a 500-picture download. I cannot leave it running standalone, as I have to watch for the errors and click on "Try again".

Any idea what is causing these errors?

I tried changing the USB port (normally the cameras are connected via a USB hub but it happens also when I connect them directly to a MB USB port) and the USB cable, but no success.

I also checked the SD card by connecting them with a card reader and running a ChkDsk on them but it found no errors on the cards.

Update: No problem when I copy the pictures manually with the Windows Explorer. And no problem either when I access the card with a reader. The builtin import tool of Windows is convenient as it sorts the pictures automatically by date (1 folder per day). And this is the way I sort my pictures.