Access Denied When Trying to Install Service Pack 3

When trying to install Windows XP Service Pack 3 you get an ‘Access Denied’ error.

1. Download and install the Subinacl.exe file from the Microsoft Website.

2. Open Notepad and paste following code:

cd /d “%ProgramFiles%\Windows Resource Kits\Tools”
subinacl /subkeyreg HKEY_LOCAL_MACHINE /grant=administrators=f /grant=system=f
subinacl /subkeyreg HKEY_CURRENT_USER /grant=administrators=f /grant=system=f
subinacl /subkeyreg HKEY_CLASSES_ROOT /grant=administrators=f /grant=system=f
subinacl /subdirectories %SystemDrive% /grant=administrators=f /grant=system=f
subinacl /subdirectories %windir%\*.* /grant=administrators=f /grant=system=f
secedit /configure /cfg %windir%\inf\defltbase.inf /db defltbase.sdb /verbose

3. Save the file with name “SP3.bat“.

4. Now right-click on the file and select “Run as administrator“. It might take some time to complete.

5. After completion, restart your system and now you should be able to install SP3.

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