Your PC must have JRE installed. You must install the appropriate version of Java JRE:

Download JRE for Windows 32 Here
Download JRE for Windows 64 Here

DDPB Installer

Download Installer here and follow instruction below:

You still need to turn on development mode and obtain PlayBook’s IP Address by using microUSB cable or connect PlayBook to the same WiFi network as your PC.

• When using cable to connect PlayBook to PC, you can press the Refresh Button to let the program detecting the IP Address of PlayBook. 
• To choose bar file from your PC, click Add and load BAR files into DDPB
• When you click Install Button, just wait for transfer completion.
• Or you can check the “Run after finish” and the application should start automatically after being installed.