DOS Access in Windows 7

[Axelion]

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?

 

[Axelion]

Never mind, I found it on the german language site. I used google language tools to translate the website.