WinDjView is perhaps the most famous DjVu reader for Windows. While it is primarily a viewer, it serves as a powerful converter when paired with a "Print to PDF" driver.
Here are the most reliable software options that still fully support the Windows 7 environment: 1. WinDjView (The Lightweight Classic) djvu to pdf converter download for windows 7
Download one of the tools mentioned above from a reputable source like SourceForge or the official developer site. WinDjView is perhaps the most famous DjVu reader for Windows