On my PC, I had Windows XP as well as Ubuntu Linux installed. With the deadline of Win XP support fast approaching, I decided I needed to get a newer version of Windows installed. Because of this, I purchased this item. Upon receiving this item, I installed Windows 7 on the partition which I had Windows XP on. About forty-five minutes later, I rebooted and reinstalled the Grub2 boot-loader to allow me to use both Win 7 & and Ubuntu.
I had written this review because I was initially put off by negative reviews from the Amazon.com but had taken the chance and thankfully it had paid off with a painless and hassle free installation. Most of the negative reviews were about the product key. I can not speculate about specific instances but the only thing I can think of is that the product key was incorrectly entered. On the packaging of this product, it contains the product key but the key is in very small writing. Before installation, I had written the product key onto a piece of paper and put enough spacing between the individual product key character groups in order to make it easier to read. I then double checked the product key I had written down to ensure there was no mistakes and when installed Windows 7. I would highly recommend doing this as it saves a lot of hassle that other reviewers had experienced.