If synchronization stops before reaching 15% the error comes from a local problem. Try the following:
Make sure that your internet connection is stable.
Start PPC sync as an administrator. (Right-click on the PPC3 Sync icon -> Run as administrator)
Change USB port and USB cable.
Turn of anti-virus programs and firewalls which are active on your computer.
Re-boot your router and/or modem.
Install PPC3 sync on another computer and synchronize it through that one.
Please return to BSR support you still cannot synchronize.