Windows Vista's XP compatability mode works pretty well for most
applications, but many games include copy-protection schemes that are quite
invasive and system-specific. Starforce is one such technology, and you
really have to get an update from Starforce or Ubisoft to get it work on the
newer versions of Windows, either x86 or x64. We've pushed hard on the
various vendors of these technologies to support Windows Vista and x64
versions of Windows, but in the end it is up to them to do so.
SDE, XNA Developer Connection
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