Hp — TRANSACTION ID is required

I,WASIM AHMED MULLICK,purchased a HP Pavilion Dv-4 1318TU notebook on 24 day of september,2009 from E-MALL,kolkata.The case memo no is T8/3158.The serial no of the notebook is CND9324FSC.The TRANSACTION ID is required for upgrading my operating system to WINDOWS 7 but i cannot find this.I don't know what is TRANSACTION ID.I am sure that the case memo no is not TRANSACTION ID.Please tell me in details where fom i get the TRANSACTION ID. Please inform me as early as possible.
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i want to know where i can find the transaction id.pls let me know too.
how to find transaction id???

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