Thank you very much, the solution worked for me !!! Actually the problem started after windows 10 update and as per your solutions by enabling the "User Account Control: Use Admin Approval Mode for the built-in Administrator account" it worked. Enabled means - The built-in Administrator account uses Admin Approval Mode. By default, any operation that requires elevation of privilege will prompt the user to approve the operation. Note : just a small update along with this i have also enabled "Accounts: Administrator account status" , this security setting determines whether the local Administrator account is enabled or disabled.
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