I tried reinstalling anaconda navigator but still facing the same error. I have 64-bit OS. Couldn’t quite understand other answers on the same error on exactly what to do here.
The error is coming while importing any library.

OSError                                   Traceback (most recent call last)
<ipython-input-2-7dd3504c366f> in <module>
----> 1 import pandas as pd

~AppDataRoamingPythonPython38site-packagespandas__init__.py in <module>
      9 for dependency in hard_dependencies:
     10     try:
---> 11         __import__(dependency)
     12     except ImportError as e:
     13         missing_dependencies.append(f"{dependency}: {e}")

~AppDataRoamingPythonPython38site-packagesnumpy__init__.py in <module>
    136 
    137     # Allow distributors to run custom init code
--> 138     from . import _distributor_init
    139 
    140     from . import core

~AppDataRoamingPythonPython38site-packagesnumpy_distributor_init.py in <module>
     24                 # NOTE: would it change behavior to load ALL
     25                 # DLLs at this path vs. the name restriction?
---> 26                 WinDLL(os.path.abspath(filename))
     27                 DLL_filenames.append(filename)
     28         if len(DLL_filenames) > 1:

~anaconda3libctypes__init__.py in __init__(self, name, mode, handle, use_errno, use_last_error, winmode)
    371 
    372         if handle is None:
--> 373             self._handle = _dlopen(self._name, mode)
    374         else:
    375             self._handle = handle

OSError: [WinError 193] %1 is not a valid Win32 application

Source: Python-3x Questions