If you guys are using the v1.0.166 version for MW2, here's the link to get you to level 70 at the prestige as well.
Instruction:
INSTANT LVL 70 10th PRESTIGE:
1) Open mw2, don't press play yet.
2) Alt-tab out of the game.
3) Click easy upgrade.
done
download:
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I just tried it, and it works like a charm. No virus/spyware, scanned by NIS 2010.