Spyder launching issue

Good evening from Vienna,

might I ask for any support on the following subject.

Every time I attempt to launch Spyder from Anaconda prompt ( from Navigator nothing works at all) I get the error message:

(base) C:\Users\User>spyder
Traceback (most recent call last):
File “C:\Users\User\anaconda3\Scripts\spyder-script.py”, line 6, in
from spyder.app.start import main
File “C:\Users\User\anaconda3\Lib\site-packages\spyder\app\start.py”, line 44, in
import zmq
ModuleNotFoundError: No module named ‘zmq’

Zmq is installed in the folder lib\site-packages on my Windows PC 64 bit.

Thank you very much in advance

Christoph