[Python] my python shows this error: Fatal error in launcher [WinError 5] because I renamed my...

I renamed my user folder name. Paths are as follows:

• 
  <olduser>: my old user name
  
  
• 
  <renameduser>: my new user name that I renamed from the old one
  

When I try to use pip it shows this error:

Fatal error in launcher, unable to create process using '"c:\users\<olduser>\appdata\local\programs\python\python39.exe" "c:\users\<renameduser>\appdata\local\programs\python\python39.exe\Scripts\pip.exe" ': The system cannot find the file specified.

When I try to run python it shows access denied. Can someone suggest a solution for me?

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