Hi black onie,
If your main goal is to recover the customer's data before replacing the PC, a full Windows 7 repair may not be necessary right away. In many cases, if the hard drive is still healthy and detectable, you can connect it to another computer using a SATA-to-USB adapter or an external drive enclosure and copy the files directly.
If the computer will not start normally, you may also be able to access the data by booting from a recovery environment, Windows PE media, or a Linux live USB, then copying important files to an external storage device before making any major changes to the system.
Please note that Windows 7 reached its end of support on January 14, 2020, and Microsoft no longer provides ongoing support or updated installation media for the operating system. If recovery media is required, the original PC manufacturer may be able to provide OEM recovery options specific to that device.
Best of luck with the data recovery process. Let me know if you need further assistance, feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.
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