I've install conda 4.3.23 on Windows 64 and I have the same problem:
After deactivate an environement, I loose the path and then commands are not recognized as an internal or external command or an executable file.
Please, how can I arrange this problem?
here you can see the terminal window
Another use has the same problem (his post here) and said that conda 4.3.22 arrange this problem, but in 23 it happend again.