my phone is not connect to htc sync in windows 8.1 topic

hi,
i have installed latest windows 8.1 but i can't connect my phone to pc using htc sync
i have try latest htc sync and desable antivirus ...and then install all drivers of my phone
but, still not working
in the device manager my phone is shown in other devices it shows android phone with yellow triangle....

can anyone help me ...