i want to reformat my pc i had vista and bought the windows 7 upgrade home premium when tried it said the product key was invalid it's registered
with microsoft when i tried to change the product key it keeps going back to
the old one what do i do .......... :)

thank u
2 answers Last reply
More about reformat
  1. I would say get on the phone with tech support at MS, they should be able to help with this.
  2. Please follow this support page below:

    You can also call Call Microsoft at (866) 234-6020.

    No one in this forum can help you with this issue.

    Microsoft must be contacted if your purchased CD-KEY is already used.
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