Here is a similar thread "How to Recover an Unsaved Word 2007 File", there are 3 marked answers on this thread, you may have a look.
One of them is from "Humphrey77", this user recommends searching for AutoRecover Files, I suggest you try it first.
In addition, you may also refer to Microsoft article "Recover a lost, unsaved, or corrupted Word document" mentioned by Daniel Jackson.
I hope the information could be helpful.
Besides, please note Office 2007 reached end of support on October 10, 2017, which means Microsoft no longer provides technical support and security updates for it. For the reasons for security and better user experience, we recommend upgrading to one newer version of Office.
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