Use the Official Adobe Word to PDF tool to convert documents directly in your browser while ensuring high-quality formatting.
If you have a stable internet connection, online tools are often more convenient than installing software on an older OS: Use the Official Adobe Word to PDF tool
A long-standing open-source favorite, PDFCreator allows you to create PDFs from any application that can print. The free version is ad-supported but highly effective for Windows 7 users. Use the Official Adobe Word to PDF tool