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You may be running into a permission issue preventing the install from going into the default location. Make sure you are running the installer as an administrator when you go to install.
For Windows 7, right click the installer you wish to run and find the menu option that says "Run as Administrator."
For Windows 8, you can try the following to "Run as Administrator"
Switch to the "Metro Start" screen and start typing the program's name to see your program under the "Applications" list.
Right-click on the program name to see "Advanced" options.
Click on "Advanced" and then select "Run as administrator" option.