HTC Sync Manager is the default PC suite software that help you to sync your HTC Phone with PC. The application has simple settings through which you can backup your data and sync music files. Also you can run new software updates through the PC Suite.
To install first connect HTC Phone to your PC through usb cable.
For high end models like HTC One you will get two thing in My Computer. One is HTC CD Drive and the second one is HTC One Media Device which is the internal storage.
Click on HTC CD Drive and run setup of HTC Sync Manager.
The setup will download the latest version from web which is around 124MB. One download is over follow the on screen instructions.
That’s all. It is installed and you can now sync your phone with your pc. You can also download this from htc.com.