pywin32にてExcel起動しない。。

com_error                                 Traceback (most recent call last)
c:\users\arata\appdata\local\programs\python\python38\lib\site-packages\win32com\client\dynamic.py in _GetGoodDispatch(IDispatch, clsctx)
     80                 try:
---> 81                         IDispatch = pythoncom.connect(IDispatch)
     82                 except pythoncom.ole_error:

com_error: (-2147221021, '操作を利用できません', None, None)

During handling of the above exception, another exception occurred:

com_error                                 Traceback (most recent call last)
<ipython-input-17-f57ef7dc902d> in <module>
      1 import win32com.client as com
      2 
----> 3 app = com.Dispatch("Excel.Application")
      4 app.Visible = True
      5 app.DisplayAlerts = False

c:\users\arata\appdata\local\programs\python\python38\lib\site-packages\win32com\client\__init__.py in Dispatch(dispatch, userName, resultCLSID, typeinfo, UnicodeToString, clsctx)
     93   """
     94   assert UnicodeToString is None, "this is deprecated and will go away"
---> 95   dispatch, userName = dynamic._GetGoodDispatchAndUserName(dispatch,userName,clsctx)
     96   return __WrapDispatch(dispatch, userName, resultCLSID, typeinfo, clsctx=clsctx)
     97 

c:\users\arata\appdata\local\programs\python\python38\lib\site-packages\win32com\client\dynamic.py in _GetGoodDispatchAndUserName(IDispatch, userName, clsctx)
     96         else:
     97                 userName = str(userName)
---> 98         return (_GetGoodDispatch(IDispatch, clsctx), userName)
     99 
    100 def _GetDescInvokeType(entry, invoke_type):

c:\users\arata\appdata\local\programs\python\python38\lib\site-packages\win32com\client\dynamic.py in _GetGoodDispatch(IDispatch, clsctx)
     81                         IDispatch = pythoncom.connect(IDispatch)
     82                 except pythoncom.ole_error:
---> 83                         IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx, pythoncom.IID_IDispatch)
     84         else:
     85                 # may already be a wrapped class.

com_error: (-2146959355, 'サーバーの実行に失敗しました', None, None)

import win32com.client as com

app = com.Dispatch("Excel.Application")
app.Visible = True
app.DisplayAlerts = False