You most read better in link that i have posted.
There are two option in link reinstall with
Restart Pc,them test
Read
Also in Environment Variables Path.
Point to your installation path 3.7 or 3.8 just the same.
Restart Pc,then test
There are two option in link reinstall with
Add Python 3.8 to PATH
mark on.Restart Pc,them test
python
and pip
again.Read
Fixing Path if needed
in link,to fix and exiting installation. Also in Environment Variables Path.
Point to your installation path 3.7 or 3.8 just the same.
Restart Pc,then test
python
and pip
again.