DOS Access in Windows 7

I'm trying to unlock gtx 465 to gtx 470 but the problem is, I don't know how to get into dos system in windows 7.
http://www.youtube.com/watch?v=kQCmF3fMjXM
Like the video above. I see USB stick but what file should I put?
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  1. Never mind, I found it on the german language site. I used google language tools to translate the website.
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