Rights problem

OK this is a regular side effect of the NTFS files system. and the implementation of the dual rights system of the UAC where you are a standard and admin user

When you replace your OS by any other method other than an upgrade, although you my recreate a new user with an identical name to the previous one windows will actually crate a user identity that is different.

Files on a data folder that has not been created by the new OS will retain the permissions given to the old user ID.

An administrator account will be able to manipulate this data but due to the UAC will need to elevate rights to do this. This is shown in your case by the need to click continue - this is automatic elevation.

The remove the need for this elevation you will need to take ownership of the drive or folder structure concerned and then grant full file permissions to your standard level user

To take ownership right click on the drive select security tab and then select the advanced options. on the ownership tab select change ownership and select your user id - ok t change the ownership.

Once the ownership is correct in the security tab select edit and add an entry for your user name and give this full access.

Once this is complete you should have full access to all the files.

It actually takes a lot less time to do than to explain