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Hi Patricia, my name is ***** ***** welcome to JustAnswer!
There are a couple of angles to your question here.
First, in regard to going back to your previous Windows version, that probably will not be possible to do. The reason is because when you upgraded to Windows 10, it removes the files that are necessary to revert back to your previous installation.
However, you should be able to reinstall Windows 10 with a USB flash drive, which will allow you to set the machine back up and get back into it.
Do you have any data on the machine that you can't afford to lose?