The solution disk for my sd870is is now outdated, so I cannot download my pictures anymore. what to do?

Get a card reader for your computer, if it doesn't already have one. The card will then appear as another hard drive, and you can transfer photos the same way you transfer any other kind of files.

Using a card reader is also likely to be faster than connecting the camera to the computer/

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Go on to the Canon Europe site and see if there is a firmware update if there is download it. If not proceed as Kakima says but be careful with transferring the card from camera to computer to camera etc as this action can sometime corrupt the memory card.