Thank you so much for contacting us, the error is caused due to a lack of permissions into the anaconda3 folder, you can solve your problem by granting permissions to that folder or with the following steps:
It is recommended that you install for Just Me, which will install Anaconda Distribution to just the current user account.
Change the directory where Anaconda was being installed (formerly C:\Users\USERNAME\anaconda3, and leave it as C:\Users\USERNAME\AppData\Local\anaconda3)
Change the AppData\Local attributes, taking out the only-read mark in its properties
Open Anaconda for the first time, it will ask for Admin permissions to open it for the first time. After that, there is no need for Admin permissions to open it anymore.
Let us know if that fixed your problems, if not please send us any screenshots that could be helpful to help you better.