Error: cannot add books

Running Windows 10 64 bit. Following the latest update, I am unable to add new books. I get an error message "Error cannot add books" with the following in details. "Failed to start worker process
Traceback (most recent call last):
File "site-packages\calibre\utils\ipc\pool.py", line 201, in start_worker
File "site-packages\calibre\utils\ipc\pool.py", line 189, in create_worker
File "site-packages\calibre\utils\ipc\pool.py", line 73, in start_worker
File "site-packages\calibre\utils\ipc\simple_worker.py", line 166, in start_pipe_worker
File "subprocess.py", line 711, in __init__
File "subprocess.py", line 959, in _execute_child
WindowsError: [Error 2] The system cannot find the file specified"

I do have things backed up so I could do an uninstall if needed.
Does anyone have any suggestions?
Thank You
Trish