Solve : Win 10 problem?

1.	Solve : Win 10 problem?
Answer» I've had a dual setup for a couple of years now, 7 and 10 on the same hard drive. Recently i had upgraded to the 21h1 VERSION and all went well for a couple of weeks. Now, for some reason i cannot open Win 10. All the repair options failed. I want to reinstall 21h1, but LEERY if it would make me lose Win 7. In FACT, it seems the only way I could upgrade is using win 7. I tried the 21h1 TOOL upgrade and GET nervous when it gives me 2 options only to install...on existing pc ( which I want ) or on another pc. My question is how does the program know that i have an existing corrupted version and it should be overwritten with the new installation, and not jepardize my Win 7?

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