And furthermore, Peachtree sucks. Last weekend I battled this error thrown by the Peachtree 2008 installer and this weekend I had the great pleasure of upgrading to Peachtree 2010 and being greeted by the very same error.
The fix in both cases? Simply copy the contents of the CD to the local harddisk (a network share works just as well) and then run setup.exe from there. Don’t be fooled by the suggested “solutions” from Microsoft or Installshield like I was.