When I insert the SD card with ONE XL.S in my laptop with windows XP all function of TomTom Home version 2.7.6.2056 do work. However when I insert the same SD card in my laptop with Windows 7, I get the message "Problem with Card. You can not use this card on this navigationsystem: Wester_Europe_1GB-197. Other cards do not work either.

Thanks for this info but what is your question?
Are you navigating with your PC? Because with TT you can't as Home only simulates your device.
To be able to use a non genuine map in Home you have to patch the corresponding DLL on your PC.

Thank you for your fast response. It was of course not very of me not to think about that. Tnks again

Problem solved?