Windows 7 Canoscan D646U scanner works!

That's great news! It's good to hear that the Canoscan D646U scanner is compatible with Windows 7 and that you were able to successfully install it using the XP drivers (Ver. 6.0.2b). Compatibility with older hardware can sometimes be a challenge, so it's always helpful to have success stories like yours to guide others in similar situations.
If you encounter any further issues or need assistance with Windows 7 or any other tech-related queries, feel free to ask. Good luck with your scanning tasks!