Symantec DLO Desktop Agent run error

Hello all, i facing a problem on DLO client software, we have two laptops (win7 64bit OS) failed to run the DLO Agent, it shows me the error message "The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sxstrace.exe tool for more detail." The server is windows 2008R2 64bit. anyone know the reason of this case? Thanks in advance.