Hello reghakr,
I would not recommend downloading Windows 7 from any other site than the Official Microsoft Sites.
Additionally, it's always best to make sure you have a genuine version of Windows 7, this will entitle you to recieve updates and support from Microsoft with Genuine Advantage.
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"Microsoft Genuine Advantage programs, including Windows Genuine Advantage, help you determine whether or not your copy of Windows is genuine. Genuine Windows software is published by Microsoft, properly licensed, and supported by Microsoft or an authorized partner, giving you full capabilities, access to all the latest updates, and confidence that you are getting the experience you expect. Microsoft continues to invest in education, engineering, and enforcement in order to more effectively combat software piracy. It’s part of Microsoft’s commitment to help protect its intellectual property and to help you avoid problems before they happen."
Please make sure that you have a officially licensed microsoft product which can be ordered directly from Microsoft and Authorized Resellers:
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John M
Microsoft Windows Client Team