SQL Server 2008 error: Attempted to perform an unauthorized operation, in Windows 10 x64

I was trying installing SQL Server 2008 in Windows 10 x64 (fully updated) version:1511 OS build:10586.318

Setup fails with the error "Attempted to perform an unauthorized operation".

I Googled and searched for the possible solutions of this error and followed n referred to a thread also, which was for Windows 2008 R2.

Now i did almost everything said there in that thread.

steps i did -

1)- i did a complete fresh re-install of my windows 10 x64 and updated it. I am the Admin and it's fresh new Admin account.

DESKTOP-V0OKKQV\BEAST (Computer Name\User name). computer name was assigned by windows 10 itself while during installation and username i gave when it asked for. so i didn't change the computer name , i left it it's like by default it chose for itself.

2)- i enabled on the .NET Framework 3.5(includes .NET 2.0 and 3.0)

3)- .NET Framework  4.6 Advanced series already enabled on

4)- i copied the SQL Server setup folder "Microsoft Sql Server 2008" to the C:\Users\BEAST folder.

5)- Checked for permissions to "Microsoft Sql Server 2008" folder , gave Full permissions everywhere.Unchecked Read-Only thing too.

6)- i gave Full Control on these reg key to Administrator, current user and everywhere i could

'HKLM\SOFTWARE\Microsoft\Microsoft SQL Server' &

HKLM\System\CurrentControlSet\Control\WMI\security

7)- Then i did these slipstream steps also using Command Prompt (as Adminstrator)

Downloaded the x64 package of SQL Server 2008 Service Pack 4

Extracted the service pack to C:\SP1 folder by running the following command:
SQLServer2008SP4-KB2979596-x64-ENU.exe /x:C:\SP1

installed the setup support files:
C:\SP1\x64\setup\1033\sqlsupport.msi

Ran the Setup.exe file from the SQL Server 2008 folder by specifying the /PCUSource parameter.

Navigating to the the directory using cd for C:\Users\BEAST\Microsoft Sql Server 2008

then

setup.exe /PCUSource=C:\SP1

8)- Installation of SQL Server 2008 begins.

all 7 tests and 10 rules of sql servere passed , except Windows Firewall warning only

which i skipped as i am not installing for Remote purpose , only Local system.

9)- Then installation begins as usual and errors "Attempted to perform an unauthorized operation" come in end.


Please Help! to solve this error.