When using the Add Standard TCP/IP Printer Port Wizard, you receive:
Error loading the TCP MIB library.
When you press OK, you receive:
Specified port cannot be added. Operations could not be completed.
When you press OK, the wizard terminates without adding a port.
This behavior will occur if a 3rd party version of Wsnmp32.dll is located at %SystemRoot%.
To resolve this issue:
1. Use Windows Explorer is select %SystemRoot%\Wsnmp32.dll.
2. Rename the file as Wsnmp32.Old_dll, so that it doesn't take precedence over the Microsoft supplied file at %SystemRoot%\System32\Wsnmp32.dll.