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Hi, welcome to justanswer.com! My name is Mike.I am going over your question and I will be with you shortly.
Mac drives cannot be read on Windows so it may have asked you to format it and accidentally you allowed that, does that sound possible?
Even if that turns out not to be the case, Windows obvioulsy messed up your Mac Formatted drive as it many times does. Your only option is to try recovery software to try and scan the drive for files before you reformat it for Mac. I can help you with that by remote.