Hello, Forlabs. We no longer provide support for the 2003 version.
The reason is that your new 64-bit Windows system and the 20-year-old QuickBooks software are not compatible at all. However, your data isn't deleted. It’s still on your thumb drive, it’s just locked in an old format.
In case you want to make a fresh start with a compatible version, you can check this article: System requirements for QuickBooks Desktop 2024.
Let us know if you have further questions. We're here to help you anytime.