Reset the registry and the file permissions

Original Article Found HERE

Every so often while installing a program you get an access denied and have to back off the installation.

This happend to me while installing SP3 for XP and also a codec pack. This solved the issue.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

To reset the registry and file permissions, follow these steps:

1. Download and then install the Subinacl.exe file. To do this, visit the following Microsoft Web site:
   http://www.microsoft.com/downloads/details.aspx?FamilyID=e8ba3e56-d8fe-4a91-93cf-ed6985e3927b&displaylang=en (http://www.microsoft.com/downloads/details.aspx?FamilyID=e8ba3e56-d8fe-4a91-93cf-ed6985e3927b&displaylang=en)
2. Start Notepad.
3. Copy and then paste the following text into Notepad.
   
   
   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%\repair\secsetup.inf /db secsetup.sdb /verbose
   
   
   
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4. Save this Notepad file as Reset.cmd.
5. Double-click the Reset.cmd file to run the script.
   
   Note This script file may take a long time to run. You must run this script as an administrator.
6. Install Windows XP SP3.