For Windows, you will need to install Motorola Droid Bionic drivers to root your phone:
Download Droid Bionic 32-bit Windows drivers here: Motorola_End_User_Driver_Installation_5.2.0_32bit.msi
Download Droid Bionic 64-bit Windows drivers here: Motorola_End_User_Driver_Installation_5.2.0_64bit.msi
