MacBook on a Windows network: connection problem

I have a MacBook Air on a PC network (Windows 7), and I can connect to the PC from the Mac but not the other way around. I used to be able to connect in both directions, but I think I've forgotten the password I need to connect from the PC.

Here's what happens on the PC:
- Windows Explorer>Network displays two computer icons, JOHNS-AIR (the Mac) and UPSTAIRS (the PC).
- I double-click JOHNS-AIR, getting a dialog labeled "Windows Security" that instructs me to "Enter your password to connect to: JOHNS-AIR" and displays a User ID (UPSTAIRS/jatay) and an empty text box for the password. The "jatay" part of the User ID is the name of the home folder on the Mac, and it is a shared folder.
- I provide my Apple ID, which I use as the password to my Mac, for the password, and it is rejected: "Logon failure: Unknown user name or bad password."

If my Apple ID for the Mac is the wrong password, where would I find the right one?

For what it's worth, I used a PC utility "Network Password Recovery" to try to find the password, and for "Domain:target=JOHNS-AIR" it returned "UPSTAIRS\jatay" for User and my Apple ID for Password.

Any info, many thanks....

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