Upgrading windows 7 to same version

[ryohei]

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?

 

[WR2]

Hello ryohei;
I think you want to try doing a repair install first.
How to Repair Windows 7 Installation

 

[geofelt]

You can do an upgrade and reuse your original activation key; no need to pay for a second license for the same PC.