HT4796: About Windows Migration AssistantLearn about About Windows Migration Assistant
Currently Being ModeratedNov 15, 2012 2:18 PM (in response to N J Mazzocchi)
Perhaps an obvious answer, but you need to install SP3 (Service Pack 3) for your Windows installation. It's a requirement of the Migration Assistant, as mentioned in the article you linked to.
You should be able to run Windows Update and get it installed. If not, you can download and install it manually from here: