Are you sure ? As far as I know, games protected with Safedisc 4 use a driver compatible with x64.
Axel19: you can try to update the Safedisc driver manually as explained on this page:
http://www.macrovision.com/products/...ownloads.shtml
This should allow you to run any Safedisc 2/3/4 protected game on WinXP x64.