Buying windows 7 is little confusing for those who are looking for 32 bit or 64 bit versions of it. Its because Microsoft’s store doesn’t mentions clearly which OS version they are selling and even there is no option to make this selection as of now on there website.
Here is the link to Microsoft store : http://store.microsoft.com/microsoft/Windows-Windows-7/category/102
One can search the required product using terms like “Windows 7 32 bit” or “Windows 7 64 bit”. The time I am posting this, I was able to locate the 64 Bit version on Amazon “here”.