That was the first thing I checked. Only the x64 version is installed. x86 was installed previously, I have been using btsync for well over a year, before x64 was an option. It seems odd that this does not affect 1.4.103 but it does affect 1.4.106 if there is old info in the registry. If the registry is pointing to the old x86 version there is nothing there. Tell me what to clean out of the registry and I will uninstall, clean the registry and re-install.