Make sure you are NOT using the windows store APP
Turn of your antivirus or other security just to test.
If the test is good then add the IDE locations to your security exclusions / white lists.
So that would be at least two of the following.
C:\Program Files (x86)\Arduino
C:\Users\yourname\AppData\Local\Arduino15 depends on IDE
C:\Users\yourname\AppData\Roaming\Arduino15 depends on IDE
If you have your sketches set up in a different location it’s also worth adding that directory to the
exclusions also.
Additionally if you also use the online IDE “CREATE” the following directories.
Also ensure that any BROWSER add ons are disabled for CREATE tests !
C:\Users\yourname\AppData\Roaming\ArduinoCreateAgent
C:\Users\yourname\AppData.arduino-create
If you have installed to a different drive swap the drive letter as needed.
If you also have an unzipped IDE installed that path should also be added to exclusions.
Report back any findings