1. You download a program that you cant delete.
   See example in this article here: Clicky

2. You want to customize your windows settings
   Example: you want a custom boot logo when you restart your computer these files are normally a .MUI file

3. Create custom themes make your Windows computer look like a mac or Windows XP look like Vista

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This is the standard way to take ownership of a file or folder

To take ownership and grant full control (or read write) permissions of files or folders in Windows Vista and Windows 7 / Windows 8, do these steps.

• In Windows Explorer window, locate the files or folders that you want to take ownership and grant or change full control or other access permissions.
• Right click on the file or directory, and then select Properties on the right click menu.
  
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This trick works in Windows 7, and Vista (I use it in Vista and it works Great )

Install

In the navigation bar on the left-hand side of the "Open" and "Save As" dialog boxes there are options like My Recent Documents, My Documents, Desktop etc. This is convenient for when you open the same files over and over. Here's how to add one of your frequently used folders without having to navigate all over your network to find it.

Go to "Open" or "Save As". In this example, I want to add the folder called "Reports" I use this reports folder a LOT (which contains subfolders)