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Buy other stuff at Amazon.com...
Set up a Normal User Account (and use it)
For everyday use, login as a Standard user, NOT an administrative user. Logging in as a standard user restricts the things that can be done without the administrator password (such as installing software).
$2990 SAVE $2000 = 40.0% Teradek Beam Transmitter & Receiver Set with V-Mount in Computers: Peripherals