Invalid O/S

Hello, windows vista as deleted from my friend's laptop in an effort to download windows 7.
She's getting "invalid O/S" and can't get past the message.She's need to get online to download windows 7. How can she do that
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  1. How was it deleted? an operating system doesn't get deleted while downloading.
    Were you downloading from Microsoft?
    If you were downloading a pirated copy, who knows what virus was included.
    The laptop should have a restore partition to restore Vista, however this will restore it as new from the maker and all data will be LOST.

    Maybe you mean you were trying to install Windows 7 upgrade rather then downloading, if that's the case, you need to tell how this was done ie; the procedure you used in detail.
    Downloading and installing are 2 entirely different functions.
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