How to download for the nubs
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Step 1. Go to Microsoft's official site to get the Release Candidate.
Step 2. Log in using your Live.com account and request the proper download (32-bit or 64-bit).
Step 3. Start the download -- it may be a bit slow-going or require a few tries.
Step 4. You should receive a product key along with your download.
Step 5. Once the download is finished, you'll have an ISO file on your computer. If you are preforming a clean istallation, you'll need to burn this onto a blank DVD before you can install Windows 7. ISO Recorder is an excellent free program you can use to do this.
If you are upgrading from Vista, you can instead copy the contents of the ISO file to a folder on your hard drive and run the setup from there. You can use the free and open-source 7zip to copy everything from the ISO file to a folder on your hard drive, then just run the setup.exe file.