Where can I download an updated version of Windows 7 Home Basic?

http://ift.tt/1iZHv9S

I have a laptop I bought 2-3 years ago. After I bought it, I made recovery CDs, but the recovery CDs are filled with bloatware. Also, when I made the CDs, Windows service pack 1 was not released, so when I re-format my laptop I have a lot to update!

My OS is Windows 7 Home Basic. Where can I download the OS and/or its service packs, rather than using the updater? I have the product key, so I just need the OS.

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