How do I go back & make the USB bootable or find a product key?

I did the USB bootable to my netbook which has windows 7 starter edition for which I have a product key for. no option came to the choice except windows 7 Professional. so I chose the upgrade now I don't have a key for professionals

Where have you bought the license for Windows 7 Professional?

Find your key product if your purchase of Microsoft Store:
http://store.Microsoft.com/Help/FAQ?Err=T2#AT2

Contact the Microsoft store:
US: http://www.store.microsoft.com/Help/Contact-Us
1-877-696-7786
Canada: https://www.microsoftstore.ca/shop/en-CA/Contact-Us

Tags: Windows

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