I am using selenium with python and have downloaded the chromedriver for my windows computer from this site: http://chromedriver.storage.googleapis.com/index.html?path=2.15/
When I downloaded chromedriver.exe I just move it in PATH folder C:\Windows\System32\chromedriver.exe and had exact same problem.
For me solution was to just change folder in PATH, so I just moved it at Pycharm Community bin folder that was also in PATH. ex: