Several reputable providers offer free versions of the Code 39 font compatible with Windows 7:

A modern, open-source project by Lasse Fister. It includes versions with and without human-readable text below the bars.

Provides a free version of their Code 39 font, though it is limited to a single size. They also offer a "Human Readable" version that places the text below the barcode.

Generating barcodes in Windows 7 is a simple process that requires a specialized to convert standard text into scannable bars. Code 39 (also known as "3 of 9") is the most popular choice for this because it supports letters, numbers, and certain symbols without requiring complex checksum calculations. Where to Download Code 39 Fonts for Windows 7

Offers a widely used, standard Code 39 TrueType font that works across all Windows programs including Word and Excel.

Once you have downloaded the .zip file from one of the sources above, follow these steps to install it on your system: Free Barcode Font - Code 39 True Type - Barcodesinc.com