How to find product key for installed software in windows 7 using script

I need product keys for Installed Softwares like MS office, Adobe products.
I need to collect this information for audit purpose.
Please let me know if any scripts available, or any manual search also fine.

For a more in-depth picture of your system; for hardware and software along withe product keys, Belarc Advisor is a great program. I highly recommend it.

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