New
#21
Why would you buy new Win7? You own the copy that came with your notebook for it's life to reinstall as many times as you want and in the way that you want - either Clean Reinstall Windows 7 Factory OEM or running Factory Recovery from its partition or disks you made or order from Tech Support.
If you've used the new copy DVD to reinstall then insert the Product Key from the sticker on bottom of laptop to activate it. Save the new key you bought unnecessarily to use elsewhere so you don't waste the money completely.
As stated in the steps in the blue link to get a perfect Clean Reinstall Windows 7 Factory OEM the drivers are mostly in the installer, while newer will be delivered quickly via optional Windows Updates after a few rounds. I am sorry no one mentioned this but they must be thinking of XP and not WIn7 which is the authority on its own drivers.
Any drivers then missing in Device Manager can be found on the Support Downloads webpage for your model. I would not change out any drivers that are given by the installer or Updates unless performance dictates doing so.