The error indicates that nothing was added to the treeview, meaning registry entries for Web Designer and/or Xtreme were found. However, attempts to read the other registry keys needed to fill out the other controls on the XaReg window were either denied access or were not there to be read.
I would recommend deleting the current XaReg.exe and the dac.ini file in the same folder. Download a copy of the XaReg.zip file from the Xara Xone Shareware page. http://www.xaraxone.com/html/shareware.html
Unzip the XaReg.exe to a folder on your hard drive and try running the program.
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