I have already written about the different edition of Windows 7. Windows 7 has a lot of editions with major categories as Starter, Home, Professional, Ultimate. If you want to know more about these editions, you can see my article about Windows 7 editions here. Now if you have Windows 7 Home Edition and you want to install Windows 7 Ultimate, you will have to download Windows 7 Ultimate Edition from the internet and install it.
Another easier way is to convert your Windows 7 Home DVD into Windows 7 Ultimate DVD. This can be achieved through Windows 7 ISO Image Edition Switcher. Windows 7 ISO Image Edition Switcher can be downloaded from the following location:
Convert Windows 7 Home Edition DVD to Windows 7 Ultimate DVD
Here are the usage instructions for Windows 7 ISO Image Edition Switcher:
The patches and patcher in this package can be used to convert any 32-bit image
into another 32-bit image and any 64-bit image into another 64-bit image.
For example, if you downloaded the 32-bit Ultimate ISO disc image from MSDN and
you also want a 32-bit Professional image, instead of spending another 2.3 GB of
bandwidth, you can make a copy of your Ultimate image and then patch that into a
Professional ISO disc image; the result should be exactly identical to what you
would have gotten had you downloaded the ISO image separately.
1) Run binpatch.exe
2) Select the the patch for the target edition that you want
3) Select the ISO disc image that you want to convert from
4) After patching, you should verify the SHA-1 hash of the final file and
compare that with Microsoft’s official hash to verify that the patch was
You can download Windows 7 Enterprise Edition here and activate Windows 7 from here.