he probably got pwned by the seller, either the selling is still using those keys or he's sharing those key like crazy.
try calling microsoft since if you have the retail cd maybe you can get a new key or something.
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QX9650@4.2 swiftech |9600@3.0 9700 nt
780i | 790fx
8gb ddr1200 | 8gb ddr1200
2x150gb 3x1tb |2x250gb
3x8800gtx |3x2900xt 1gb
2x20xdvdrw |2x20xdvdrw
15in1 card reader |15in1 card reader
ng15/g9 |ng15/g9
1200w psu |1200w psu
2x28" LCD |2x28" LCD
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