WIN10 cannot be opened using the built-in Administrator account

For this kind of problem in fact for the professional version of the user is not difficult, it is easy to solve, the specific method is as follows:

First Win+r input: gpedit.msc, open Group Policy, find "Windows Settings" in "Computer Configuration", "Security Settings", "Local Policies", "security options", find a policy on the right: "User Account Control: Admin Approval Mode for the built-in Administrator account, then enable, log off users, and re-login.

WIN10 cannot be opened using the built-in Administrator account