Question: I've lost a couple of hours trying to solve this so I guess it's time to ask someone/somehwere. I (think) I have uninstalled everything related to python and than installed again. I just installed python most recent version and used pip to install pandas. I also try to install it with anaconda but the error persists. I've also tried installing directly from github but was unsuccessful. I'm using windows 10. C:\Users\m>python -V Python 3.8.2 C:\Users\m>pip install pandas Collecting pandas Downloading https://files.pythonhosted.org/packages/07/12/5a087658337a230f4a77e3d548c847e81aa59b332cdd8ddf5c8d7f11c4a1/pandas-1.0.3-cp38-cp38-win32.whl (7.6MB) |████████████████████████████████| 7.6MB 3.3MB/s Collecting pytz>=2017.2 (from pandas) Downloading https://files.pythonhosted.org/packages/e7/f9/f0b53f88060247251bf481fa6ea62cd0d25bf1b11a87888e53ce5b7c8ad2/pytz-2019.3-py2.py3-none-any.whl (509kB) |████████████████████████████████| 512kB 3.2MB/s Collecting python-dateutil>=2.6.1 (from pandas) Downloading https://files.pythonhosted.org/packages/d4/70/d60450c3dd48ef87586924207ae8907090de0b306af2bce5d134d78615cb/python_dateutil-2.8.1-py2.py3-none-any.whl (227kB) |████████████████████████████████| 235kB 6.4MB/s Collecting numpy>=1.13.3 (from pandas) Downloading https://files.pythonhosted.org/packages/5d/b3/f3543d9919baa11afc24adc029a25997821f0376e5fab75fdc16e13469db/numpy-1.18.2-cp38-cp38-win32.whl (10.8MB) |████████████████████████████████| 10.8MB 6.4MB/s Requirement already satisfied: six>=1.5 in c:\users\m\appdata\roaming\python\python38\site-packages (from python-dateutil>=2.6.1->pandas) (1.13.0) Installing collected packages: pytz, python-dateutil, numpy, pandas Successfully installed numpy-1.18.2 pandas-1.0.3 python-dateutil-2.8.1 pytz-2019.3 WARNING: You are using pip version 19.2.3, however version 20.0.2 is available. You should consider upgrading via the 'python -m pip install --upgrade pip' command. C:\Users\m>python Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import pandas Traceback (most recent call last): File "<stdin>", line 1, in <module> File "C:\Users\m\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pandas\__init__.py", line 55, in <module> from pandas.core.api import ( File "C:\Users\m\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pandas\core\api.py", line 29, in <module> from pandas.core.groupby import Grouper, NamedAgg File "C:\Users\m\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pandas\core\groupby\__init__.py", line 1, in <module> from pandas.core.groupby.generic import DataFrameGroupBy, NamedAgg, SeriesGroupBy File "C:\Users\m\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pandas\core\groupby\generic.py", line 60, in <module> from pandas.core.frame import DataFrame File "C:\Users\m\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pandas\core\frame.py", line 124, in <module> from pandas.core.series import Series File "C:\Users\m\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pandas\core\series.py", line 4572, in <module> Series._add_series_or_dataframe_operations() File "C:\Users\m\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pandas\core\generic.py", line 10349, in _add_series_or_dataframe_operations from pandas.core.window import EWM, Expanding, Rolling, Window File "C:\Users\m\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pandas\core\window\__init__.py", line 1, in <module> from pandas.core.window.ewm import EWM # noqa:F401 File "C:\Users\m\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pandas\core\window\ewm.py", line 5, in <module> import pandas._libs.window.aggregations as window_aggregations ImportError: DLL load failed while importing aggregations: The specified module could not be found. 

Answer: I finally ended up trying a slightly older version of pandas to resolve this exact error. The default install was 1.0.3, so I backed up a couple of release points: pip uninstall pandas pip install pandas==1.0.1  Then I could import pandas without error