Can someone tell me how to get a clean install of windows 10 onto a PC with windows 7?

[Linda Wri]

i'm trying to install windows 10 onto a pc with windows 7 and have gotten the following message..."the system registry contains invalid file paths. Installation cannot proceed. This system image was applied without guaranteeing that drive-letter assignments would match across computers." I'm not able to click on anything (mouse isn't there) or get rid of the box. I have to do a hard shutdown. Any idea what i can do to make this work?

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