If you already have Windows 7 and it's not genuine, just use the activator and that is all you will need to do.

Download links to everything you need:
Windows 7 Activator:(make windows genuine)
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Winrar:(to extract files)
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Be sure you know if you are a x32 or x64 based operating system.

Magic Disc:(to run .iso's off your computer)
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Windows 7 Ultimate .iso:(installation disc)
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I take no credit for any of these files. I am simply reuploading them for you guys.

1. You want to start off by downloading the Windows 7 activator then extracting it to a usb.
Be sure to disable all virus scanners/fire walls. For some reason all computers detect any kind of activator as a virus even if it's not. Again this is not a virus! Also put the winrar setup on your usb becuase you will need these later.

2.Download and extract the Windows 7 .iso. (higlight all 4 parts then right click, then extract here)

3.Download setup_magicdisc106.exe and then install it.

4.Run the Windows 7 iso using magic disc. Right click the image,click mount, then open the windows 7 iso.
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This will back up all your programs and anything else so there is no need for you to back it up your self.

5.After it has installed(this may take awhile) and you get to the screen where it asks for a product key, just make yours up because it won't matter what you put.

6.When it has fully installed you will then run the Windows 7 loader I have provided.

7.The activator will do most the work so just follow the steps it gives you.

You should have Windows 7 Ultimate now and if you go to the start menu> right click computer> properties. You should now see:

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If you see the genuine stamp(may take a moment to load) on there you know you followed the instructions correctly.
Please thank the topic. Alot of time was put into making this tutorial.