I'm on W7 as well. When I installed the game yesterday, both (x64 and x86) redistributables we installed automatically. I assume I already had them downloaded with a Windows update or had previously installed them.
Go this page on the Microsoft site:
http://www.microsoft.com/en-gb/download/details.aspx?id=40784
Click on "Download", and on the next page select BOTH vcredist_x64.exe AND vcredist_x86.exe. Save the files and run them both, then restart the NA installation.
Hope that helps.