In order to use the NTB runtime system for MPC555 with deep, you have to install the deep runtime system seperately. See deep overview page for a download link.
After extracting the library you can change the default library path for the plugin in the Deep Preferences section of your workspace settings. (Choose Window ⇒ Preferences in your eclipse workspace)
Windows
Supported Versions
To install deep you need at least Windows XP. For Windows 7 64-bit you have to install the 64-bit version of Eclipse and the JDK!