Upgrading windows 7 to same version

my windows 7 install was totally messed up when i tried to install osx86, but the data is still on the partition. i want to use a new windows 7 home premium DVD that i just bought, can i use it to upgrade my existing home premium to the new version, and and keep my existing data?
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More about upgrading windows version
  1. Hello ryohei;
    I think you want to try doing a repair install first.
    How to Repair Windows 7 Installation
  2. You can do an upgrade and reuse your original activation key; no need to pay for a second license for the same PC.
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