I have Vista:
C>Program Files>AdobeCS4>Presets>Camera Profiles
No, that document just lists camera/lens specific profiles for the Lens Distortion filter.
The canned ACR profiles are at "C:\ProgramData\Adobe\CameraRaw\CameraProfiles", while custom profiles created with the DNG Profile Editor will by default get saved to "C:\Users\username
It's been a whlie, but I believe under XP, the canned profiles will be in a similar folder to above, but under "C:\Documents and Settings\All Users", while the custom profiles would be somewhere under "C:\Documents and Settings\username