Where did you install it first?
Where did you get the disk?
If it was at your cousins house then you SOL cause he activated it first
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| CPU: Intel Core2Quad Q6600 (G0) @ 3GHz | GPU: MSI 8800GT 512MB | Memory: 4GB (2x 2GB) G-Skill DDR2 @ 1000MHz Dual Channel | Monitor: Viewsonic Q20WB 20" LCD @ 1680x1050 | Operating System: Windows Vista Home Premium x64 |