Are you sure that is the DLL.XML that is in use now, and not some backup from a previous install ? Because, it doesn't have any error. But, since you said that *all* your addons have disappeared from the menu bar, it might only related to a corrupted DLL.XML
It might also be the EXE.XML instead but, if the DLL.XML is fine, and the EXE.XML is corrupted, you should at least see the Addons of the DLL.XML. However, it might be worth checking the EXE.XML as well.