How to wipe, erase hard drive to re-install MS 7 from OEM stick as a 'clean install'

[marl boro]

I went from Win 7 to Win 10 & back to 7. During the boot sequence a message says a disc needs to be scanned Volume Recovery. I went to a command prompt & typed chck disc but that was invalid. I put forth a similar question awhile back & they suggested for a 'clean install' to delete partitions. Plus the latency for booting is noticeable. Please advise.

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