SymptomsThere is no networking in a virtual machine. In Windows Device Manager you can see network adapters working improperly (marked with red or yellow signs). Any attempts to delete them results in error:
"Failed to uninstall the device. The device may be required to boot up the computer"
ResolutionClick on Windows Start menu and hit "Run...". This will open a window.
Type "regedit" (without quotes) in the window prompt and hit Return.
On the left pane of the screen appeared navigate to:
key and find in sub-directory a list of all network adapters. Check if there are any adapters with "Characteristics" value 0x00000029(41).
Change the value to 0x00000001(1) by double-clicking on "Characteristics" and typing 1 in the "Value data" line showed up.
After that try to delete broken network adapters again, restart the virtual machine and reinstall Parallels Tools.